reselecting previously selected text (i use this to fix botched selections):
gv " :h gv for more
" you can use `o` in visual mode to go to the `Other` end of the selection
" use a motion to fix the selection
reselecting previously yanked text:
`[v`]
`[ " marks the beginning of the previously yanked text :h `[
`] " marks the end :h `]
v " visual select everything in between
nnoremap gb `[v`] " "a quick map to perform the above
pasting and indenting text (in one go):
]p " put (p) and adjust indent to current line
]P " put the text before the cursor (P) and adjust indent to current line