How do you select all lines at the same indentation level?
vii with indent-object plugin
The vim-indent-object plugin provides ii (inner indent) and ai (around indent) text objects.
Tag: select
How do you select from cursor to a mark in visual mode?
v'a
Press v for visual mode, then 'a to extend the selection to mark a.
How do you select from cursor to end of line in visual mode?
v$
Press v to enter character-wise visual mode, then $ to extend selection to the end of the line (excluding the newline).
How do you select text inside HTML/XML tags?
vit
Press vit to select the inner content of the nearest HTML/XML tag.