Reading a list won't make them stick. ShortcutFoo has you type each shortcut, then brings it back just before you'd forget it.
Site wide
7 shortcuts- SFocus search bar
- GNGo to notifications
- GDGo to dashboard
- JMove selection down
- KMove selection up
- XToggle selection
- ↵Open selection
Repositories
4 shortcuts- GCGo to code
- GIGo to issues
- GPGo to pull requests
- GWGo to wiki
Source Code Browsing
5 shortcuts- TActivate the file finder
- LJump to line
- WSwitch branch/tag
- YExpand URL to its canonical form
- IShow/hide all inline notes
Issues
9 shortcuts- ⌘↵Submit comment
- ⌘⇧PPreview comment
- ⌘⇧LGo fullscreen
- CCreate issue
- /Focus issues search bar
- LFilter by or edit labels
- MFilter by or edit milestones
- AFilter by or edit assignee
- RReply (quoting selected text)
Browsing Commits
4 shortcuts- ⌘↵Submit comment
- ESCClose form
- PParent commit
- OOther parent commit
Dashboards
2 shortcuts- GIGo to your issues
- GPGo to your pull requests
Notifications
2 shortcuts- EMark as read
- ⇧MMute thread
Pull Request List
5 shortcuts- RReply (quoting selected text)
- ↵Open issue
- ⌘↵Submit comment
- ⌘⇧PPreview comment
- ⌘⇧LGo fullscreen
Network Graph
9 shortcuts- HScroll left
- LScroll right
- KScroll up
- JScroll down
- TToggle visibility of head labels
- ⇧HScroll all the way left
- ⇧LScroll all the way right
- ⇧KScroll all the way up
- ⇧JScroll all the way down
Achievement unlocked