Music theory, numbered chord analysis (Roman numerals), and figuring out the letter names of chords are covered in great detail in this video. You should have a pretty good grasp on how to figure out what to call the chords in any piece by the end of this. Think of it as parts of 1-2 years of college music theory. It's pretty detailed so don't feel bad if you need a few listenings over a few days for it to sink in.
0:00 - 3 things you gotta know!
2:27 - The 1st measure!
6:07 - First progression
14:10 - Something new?
19:43 - Pivot chords
21:45 - 3rd progressions
29:36 - Sequences
36:41 - Bach Home!
43:38 - WHAT?
47:51 - Standing on V
54:33 - One final trick
58:47 - Piece with chords
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