Callenby wrote:For those of you who are trying to learn theory on your own and feel completely lost, I copied down the table of contents from my textbook so you know what sort of things to be looking for, a good order in which to learn them, and overall get a better sense of the vocabulary. This is just a guide, though, so you'll have to look up the information on your own (I implore you to buy the textbook or another like it. It's worth the investment). This list covers more than 700 pages and this only scratches the surface of music theory.
Part One
I. Assorted Preliminaries: Pitch (staff, clefs, solmization, the hexachord system, accidentals); Modes, Scales and Evolution (church modes, musica ficta), Metric Matters (meter, the dot, early meter signatures, hypermeter), Sound (overtones, the legend of Pythagoras, equal temperament)
II. Intervals: Intervals of the Major Scale (enharmonic intervals, inversion, simple versus compound, diatonic versus chromatic, consonance versus dissonance)
Part Two (Diatonic Harmony)
I. Basic Harmonic Structures: Triads, Inversion, Seventh Chords
II. Musical shorthand - lead sheets and figured bass: Lead-Sheet Notation (lead-sheet chord symbols, expanded symbols, passing tones), Figured Bass Notation
III. Harmonies of the Major and Minor Scales: The Diatonic Chords (diatonic triads in major keys, Roman numeral symbols, diatonic triads in minor keys, showing inversion), Functional Tonality (the circle of fifths, progression, retrogression, repetition, ground bass patterns)
IV. Cadences/Harmonic Rhythm: Cadences (cadences and style, standard cadences, cadential variants), Harmonic Rhythm
Part Three (Melody)
I. Melodic Pitch and Rhythm: Range, Interval Structure and Gesture, Repetition (motive, sequence, types of sequence), Melodic Tonality (scales and arpeggios, large-scale events, recognizing important pitches, tonic dominant axis)
II. Embellishing Tones: Step-Step Combinations (passing tones, neighbor tones), Step-Leap Combinations (appoggiatura, escape tone, changing tones), Step-Repetition Combinations (anticipation, suspension and retardation, other ways of designing suspensions), Embellishing Tones and Style (multiple embellishing tones, embellishing tones in jazz, embellishing tones as motives, the embellishing chord tone)
III. Melodic Form: The Phrase (phrase length, cadences, phrase relationships), Combining and Extending Phrases (the period, parallel period, contrasting period and phrase group, double period, cadential elision, phrase extension, phrasing and style)
IV. Composing Melodies: Constructing a Melody from a Motive (the initial melodic idea, the harmonic factor, devising and harmonic plan), Composing a Melody to a Harmonic Pattern
Part Four (Voice Leading)
I. Melodic Principles of Part Writing/Voicing and Connecting Chords: Melodic Principles (ranges, interval motion, leaps, sensitive tones, soprano-bass counterpoint), Voicing Chords (spacing, doubling, alternative doublings), Connecting Chords (consecutive perfect consonances, voice crossing and overlap, common tones, no common tones)
II. The Chorale/Part writing with Root Position Triads: The Chorale (melodic features), Part-Writing with Root-Position Triads (the "short rule" for connecting chords, fifth relationship, third relationship, second relationship, part writing the deceptive cadence), Part Writing Suspensions
III. Part Writing with Triads in Inversion: First Inversion (inversion and bass lines, doubling in first inversion, why the soprano?, chord connection, inversion and harmonic weight, suspensions), Second Inversion (cadential six-four chord, passing six-four chord, pedal six-four chord, arpeggiated six-four chord, variants), Voice-Leading Practices: A Summary
IV. Part Writing Seventh Chords: Dominant-Functioning Seventh Chords (the V7, chord member of not?, the unresolved leading tone, the ascending seventh, delayed resolution, the half and fully diminished seventh chords), Nondominant Seventh Chords (seventh chords and chain suspensions, the I7)
Part Five (Basic Chromatic Harmony)
I. Secondary Function: Secondary Dominants (the V/x, tonicization, the tonicizing tritone, the V7/x, common musical contexts, harmonic sequence), Secondary Leading-Tone Chords, Jazz and Popular Styles (V7/x, melodic and harmonic chromaticism, ii7-V7/x, viio7/x), Voice Leading and Harmonization
II. Modulation I: Modulation by Common Chord (crossing the "tonal border", multiple common chords), Chromatic Modulation (common contexts, multiple accidentals, modulation or tonicization?)
Part Six (Counterpoint)
I. The Art of Countermelody: Two-Voice Counterpoint (motion, 1:1 counterpoint, converting 1:1 to 2:1, essentials of counterpoint, converting 2:1 to 4:1, jazz and popular styles), Fun with Counterpoint (creating a bass, melodizing the bass, buffing the bass, adding a third voice, polyphonic or homophonic?)
II. J.S. Bach's Two-Part Inventions: The Invention (motive and countermotive, contrapuntal devices), Invention No. 6, Analysis (invertible counterpoint, tonality, harmony, implied harmony, form)
III. The Fugue: The Basics of Fugue (subject and answer, the exposition, the counter subject, the development, the recapitulation, summary, stretto and counterexpositon, the coda), Analysis (analytic comments)
Part Seven (Advanced Chromatic Harmony)
I. Mixing Modes: Change of Mode (mode and mood, keys related through mode mixture, enharmonic change of mode), Modal Borrowing (common borrowed harmonies, modal borrowing and style), Chromatic- Third Relationships (diatonic- vs. chromatic-third relationship, common chromatic-third relationships)
II. Altered Pre-dominants: The Neapolitan Sixth Chord (the harmonic nature of the Neapolitan, insertions before the V), Augmented Sixth Chords (constructing an augmented sixth chord, voice leading)
III. Other Chromatic Harmonies: Altered Dominants, Embellishing Diminished Seventh Chords (functional versus embellishing o7, spelling and resolving the embellishing o7)
IV. Modulation II: Recognizing Signals - The Three Cs (chromatic pitches, clue chords, cadences, thinking through a modulation), Back to the Tonal Border (chromatic modulations), The Secret Lives of Chords (the enharmonic Gr+6 chord, the enharmonic diminished seventh chord)
V. Selected Harmonic Structures and Techniques: Triadic Extensions (dominant ninth chords, secondary dominant ninth chords, other ninth chords, eleventh chords, the dominant eleventh chord, the minor eleventh chord, thirteenth chords), Linear Chromaticism, Harmonic Sequence
Part Eight (Arranging, Composing, and Analysis)
I. Harmonic Principles in Jazz: Extending the Triad (basic seventh chords and their extensions, voicing), Chord Substitution (simple toniciziation, the turnaround, extended tonicization, tritone-related chords, tritone substitution in the turnaround, substitution guideline, expanded tritone substitutions), Implied Lines (reading between the chord symbols, auxiliary chords)
II. The Blues: Blues Form and Harmonic Practice (the basic blues today, substitute harmonies, minor blues), Blues Melodic Practice (blue notes, blue-note scales, blue-note scales in minor blues), Blues Variants
III. Form, Process and Drama: Three Ways of Looking at Form (visual versus aural symmetry, motivic analysis, musical processes, similarity and contrast), Dramatic Shape (creating musical tension, texture)
IV. Binary and Ternary Forms: Statement-Restatement (the coda), Statement-Contrast (symmetric versus asymmetric forms), Statement-Contrast-Restatement (the bridge, rounded binary versus ternary form)
V. Shaping a Song: Text (text setting, form, text/melody relationships, text painting)
Part Nine (Twentieth-Century Techniques)
I. Syntax and Vocabulary: Syntax (planing, the non-functional dominant seventh chord, the augmented triad, modality, modal cadences), New Melodic and Harmonic Structures (pentatonic scales, quartal/quintal harmonies, whole-tone scale, other scales)
II. Neotonality: New Tonal Adventures (quartal harmonies, polychords, polytonality, bimodality, pandiatonicism), Stravinsky and Bartok (Stravinsky, Bartok, pentatonic melody, modality, hemiola)
III. Atonality and Twelve Tonality: Atonality (things you can do with a cell, hints for analysis), Twelve Tonality (choosing a row, finding the row)
Hope this helps and doesn't deter anyone from pursuing such an enormous subject.
Shucks, You stole my tutorial

It is great, pretty much what is self explained here, it is the common terms of music. Like Cellenby said and well, Order a Textbook about Music Theory, it is worth the investment. If you study in a conservatory it is great too.