From 9to5mac. Pretty good list, but many more.
App Switching + Search
Calendar
- ⌘ shift H — Go to Home Screen
- ⌘ space — Search
- ⌘ tab — Switch App
Camera
- ⌘ N — New Event
- ⌘ F — Search
- ⌘ T — Show Today
- ⌘ R — Refresh Calendars
- ⌘ 1 — Go to Day View
- ⌘ 2 — Go to Week View
- ⌘ 3 — Go to Month View
- ⌘ 4 — Go to Year View
Contacts
- Volume +/- to take a photo or start/stop a video recording
- ⌘ N — Create a New Contact
- ⌘ F — Search for a Contact
Maps
- ⌘ R — Reply
- ⌘ shift R — Reply All
- ⌘ shift F — Forward
- ⌘ shift J — Mark as Junk
- ⌘ shift L — Flag
- ⌘ shift U — Mark as Unread
- ⌘ up arrow — Go to Previous Message
- ⌘ down arrow — Go to Next Message
- delete — Delete Message
- ⌘ shift N — Get All New Mail
- ⌘ option F — Mailbox Search
- ⌘ N — New Message
Messages
- ⌘ 1 — Switch to standard
- ⌘ 2 — Switch to Transit
- ⌘ 3 — Switch to Satellite
- ⌘ F — Begin Search
Notes
- return — Send
- ⌘ N — New Message
Reminders
- ⌘ B — Bold
- ⌘ I — Italics
- ⌘ U — Underline
- ⌘ option T — Title
- ⌘ option H — Heading
- ⌘ option B — Body
- ⌘ option L — Checklist
- ⌘ shift U — Mark as Checked
- ⌘ N — New Note
- ⌘ F — Find Note
Safari
- ⌘ N — Create New Reminder
- ⌘ control I — Show Reminder Details
Pages
- ⌘ R — Reload Page
- ⌘ [ — Back
- ⌘ ] — Forward
- ⌘ F — Find…
- ⌘ L — Open Location…
- ⌘ T — New Tab
- ⌘ W — Close Tab
- control shift tab — Show Previous Tab
- control tab — Show Next Tab
- control shift \ — Show All Tabs
Keynote
- ⌘ F — Find
- ⌘ shift W — Show Word Count
- ⌘ N — Create Document
Numbers
- ⌘ N — Create Presentation
- ⌘ F — Find
- ⌘ shift K — Add Comment
- ⌘ option P — Play Slideshow
- ⌘ option A — Show Transitions and Builds
- ⌘ option N — Show Presenter Notes
You may discover that additional keyboard shortcuts you’re familiar with from the Mac also work, including ⌘ plus X/C/V for cut, copy, and paste, while some shortcuts within apps only work in certain parts of those apps. Several popular apps from the App Store also support external keyboard shortcuts. Just hold the Command ⌘ key for a few seconds in each app to find out, or try out shortcuts you know from other apps if you don’t see a list. Here are some examples from popular apps:
- ⌘ N — Create Spreadsheet
- ⌘ F — Find
- ⌘ option C — Copy Style
- ⌘ shift N — Insert Sheet
Facebook Messenger
Fantastical
- ⌘ N — New Message
- return — Line Break
- ⌘ return — Send
Google Chrome
- left arrow — Previous
- right arrow — Next
- up arrow — Earlier
- down arrow — Later
- ⌘ return — Accept
- esc — Cancel
- ⌘ N — New Event
- ⌘ S — Save
- ⌘ delete — Delete
- ⌘ F — Search
- ⌘ R — Reminders
- ⌘ I — Get Info
- ⌘ , — Preferences
- ⌘ shift F — Full Screen
- ⌘ T — Go to Today
- ⌘ K — Toggle Type
Hipchat
- ⌘ T — New Tab
- ⌘ shift N — New Incognito Tab
- ⌘ shift T — Reopened Closed Tab
- ⌘ L — Open Location…
- ⌘ W — Close Tab
- ⌘ D — Bookmark This Page…
- ⌘ F — Find in Page…
- ⌘ R — Reload
- ⌘ left arrow — Back
- ⌘ right arrow — Forward
- ⌘ Y — History
- ⌘ shift . — Voice Search
Microsoft Outlook
- ⌘ F — Search chat history
- ⌘ option 1 — Chat tab
- ⌘ option 2 — Info tab
- ⌘ option 3 — Files tab
- ⌘ option 4 — Links tab
- esc — Dismiss
Slack
- ⌘ up arrow — Select Previous Message
- ⌘ down arrow — Select Next Message
- ⌘ R — Reply
- ⌘ shift R — Reply All
- ⌘ J — Forward
- ⌘ 1 — Switch to Mail
- ⌘ 2 — Switch to Calendar
- ⌘ 3 — Switch to Files
- ⌘ 4 — Switch to People
- ⌘ 5 — Switch to Settings
- ⌘ N — Create New Message
- ⌘ shift N — Create New Event
Tweetbot
- up arrow —Move Up
- down arrow — Move Down
- option up arrow — Jump to previous channel
- option down arrow — Jump to next channel
- option shift up arrow — Jump to previous unread channel
- option shift down arrow — Jump to next unread channel
- option ` — Toggle the channel list
- ⌘ K — Show the Quick Switcher
- ⌘ T — Show the Quick Switcher (two ways!)
- ⌘ F — Perform a search
- ⌘ W — Close window
- ⌘ 1 — Timeline
- ⌘ 2 — Mentions
- ⌘ 3 — Messages
- ⌘ 4 — Stats
- ⌘ 5 — Search
- ⌘ 6 — Faves
- ⌘ 7 — Profile
- ⌘ 8 — Lists
- ⌘ 9 — Mutes
- ⌘ N — Compose