Xcode shortcuts

Comment Code -

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Alt + /      or    Command + /

Switch Between .h & .m

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Command+Windows+Up-Arrow   or   Command+Option+Up-Arrow

Short API Documentation -

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Windows+Double-click or Command+Double-click

BookMark -

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Alt+D or Control+D 

Go TO Bookmark -

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Alt+4 or Control+4

Zoom Editor-

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Alt+Shift+E or Command+Shift+E

Indentation of Code -

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Alt+] (Right) or Command+]

Alt+[ (Left)   or Command+[

Key bindings in Xcode -
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From the Xcode menu choose Preferences
Go to Tab Key Bindings
Check key Bindings Sets:"Xcode Default"
Create a Duplicate of all the default setting by clicking Duplicate button in case you have to revert it.
Click on  Actions in the list you want to change.

Enter the new key combination you want.
Click Ok to save your changes

Open Console -

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Alt+Shift+R or Command+Shift+R

Open Debugger-

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Alt+Shift+Y or Command+Shift+Y

Build Results -

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Alt+Shift+B

Jump to a Line -
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Alt + L