Select & Expand

⌘ D select current word (repeat to include next instance of word)
⌘ L select current line (repeat to include next line)
⌘ ⇧ A select text inside tag (repeat to expand)
Ctrl ⇧ M select to curly or angle brackets (repeat to expand)

Replace ⌘ with Ctrl on Windows and Linux.

Code Folding

⌘ Alt [ fold closest block
⌘ Alt ] unfold closest block
⌘ K ⌘ 1 fold all first level code blocks
⌘ K ⌘ 2 fold all second level code blocks
⌘ K ⌘ 3 (etc) fold all third level code blocks (etc)
⌘ K ⌘ T fold all HTML attributes
⌘ K ⌘ 0 unfold everything

Goto

⌘ P goto anything
⌘ P, : goto line number (enter number after :)
⌘ P, # goto and list fuzzy-matches of string (enter characters after #)
⌘ P, @ goto and list symbol (begin typing symbol name after @)

Command line

$ subl .
$ subl README.md

Use subl to open files in Sublime from the terminal.