IntelliJ idea mac Shortcut type door

First we look at the meaning of the various keys under the Mac:
? Command
? Shift
? Option
? Control
?? Return/enter
? Delete
? Forward Delete key (Fn+delete)
↑ Up ARROW
↓ DOWN ARROW
← Left Arrow
→ Right Arrow
? Page Up (fn+↑)
? Page Down (fn+↓)
Home Fn +←
End Fn +→
? Right tab (Tab key)
? Left tab (SHIFT+TAB)
? Escape (ESC)

1.? O find the name of the class in the project

? O two searches for the name in the source package

2.?? O Find Files

3. fn? F12 viewing the structure in a class

IntelliJ idea mac Shortcut type door