2. Shortcuts to open Android apps
* Search + B : Open the browser
* Search + C : Open Contacts
* Search + E : Open Email
* Search + G : Open Gmail
* Search + P : Open the music player program
* Search + S : Open the message
* Search + Y: Open YouTube
3. Shortcuts in the browser
* Menu + J : Return to the page
* Menu + K : Go to the next page
* Menu + R : Refresh (Refresh) the current page
* Menu + F : Find a page
* Menu + B : Open bookmarks
* Menu + A : Add bookmarks
* Menu + S : Open the social network sharing menu
* Menu + H : Open History
* Menu + S : Open browser options
* Menu + D : Download
* Menu + G : View page information
* Menu + E : Select the text
4. Shortcuts in Gmail of Android
* R : Reply to an existing message
* A : Return to all in the mail
* Y : View saved messages
* Menu + U : Refresh the mailbox
* Menu + C : Write a new e-mail
* Alt + Up : Go to the top
* Alt + Down: Down to the bottom
5. Shortcut key when editing
* Shift + Del : Delete the characters to the right of the cursor
* Alt- + Del: Delete the whole line
* Shift + Shift (Double-click): Activate caps-lock; Press Shift once to exit
* Alt + Left : Move the cursor to the beginning of the line
* Alt + Right : Move the cursor to the end of the line
* Alt + Up : Move the cursor over the page
* Alt + Down : Move the cursor to the bottom of the page
* Shift + Left / Right : Highlight text to cut or copy.
Refer to some of the following articles:
Good luck!