Vim keys

I decided to check on my knowledge on what each key does in Vim, to find gaps in my knowledge and see if efficiency and proficiency can be improved.

• q, record macro, takes a register name
• Q, enter command (Ex) mode
• w, move forward to start of next word
• W, same as w, but uses a different match for word boundary
• e, to end of word
• E, same as e, but different boundary
• r, replace current char, takes another letter
• R, replace with overwrite
• t, not sure what it does by itself, usually as part of another command, to indicate until, like dtw, delete until the letter w
• T, no idea
• y, copy (or yank)
• Y, copy current line (to register ")
• u, undo
• U, no idea
• i, enter insert mode before cursor
• I, enter insert mode at the start of current line
• o, start an empty new line after current cursor and enter insert mode
• O, start an empty new line before current cursor and enter insert mode
• p, paste (from register ")
• P, paste before cursor
• [, not sure what it does by itself, usually with another key
• {, jump to previous paragraph (new line delimited)
• ], not sure
• }, jump to next paragraph (new line delimited)
• \, no idea
• |, no idea,
• a, enter insert mode after cursor
• A, enter insert mode at end of current line
• s, delete char at cursor and enter insert mode
• S, not sure
• d, delete, takes a motion
• D, delete till end of line
• f, takes another letter, jump to next letter on current line
• F, takes another letter, jump to previous letter on current line
• g, does nothing by itself, takes a letter like g (start of document) or G, (end of document) and jumps there
  • with u, make lowercase
  • with U, make uppercase
  • with g, go to first line
• G, go to end of document
• h, move cursor left
• H, no idea
• j, move cursor down
• J, join line
• k, move cursor up
• K, look up current word in man pages
• l, move cursor right
• L, no idea
• ;, does nothing, mostly mapped to a leader
• :, enter command
• ', takes a mark (usually letters, but there are special symbols), and jumps to it
• ", no idea
• z, takes another letter, usually have to do with folding
• Z, no idea
• x, delete char under cursor
• X, not sure
• c, takes a motion key, changes till motion, a combination of d and i
• C, changes till end of line
• v, enter visual move
• V, visually select current line
• b, go back a word
• B, not sure, probably back a word but with different word boundary
• n, next match (after a search)
• N, previous match (after a search)
• m, takes a letter, bookmark current line
• M, not sure
• ,, not sure what it does by default, this is my localleader
• <, not sure what it does by itself, i use << for indent left
• ., repeat last action
• >, not sure what it does by itself, i use >> for indent right
• /, search forward
• ?, search backward
• 1 to 101, used as part of a command to specify repetition, like d3w, delete 3 words
• `, not sure, something mark related
• ~, change case
• !, not sure
• @, takes a key, run macro
• #, search backward for word under cursor
• $, jump end of line
• %, jump to matching parens/brackets/brace
• ^, jump to start of line
• &, not sure
• *, search forward for word under cursor
• (, not sure, probably like {
• ), not sure, probably like }
• -, not sure
• _, not sure
• =, takes a motion, indents
• +, not sure

The next step is to figure out what those keys that I am unsure about actually do.