File > Close (Mathematica Menu Item)

Close closes the current notebook.

Cell > Cell Tags > Find Cell Tag (Mathematica Menu Item)

Find Cell Tag opens a submenu to find and select cells based on their cell tags.

Window > Magnification (Mathematica Menu Item)

Magnification changes the display magnification for a notebook.

File > Printing Settings > Printing ... (Mathematica Menu Item)

Printing Environment determines which style environment to use for printing.

Format > Screen Environment (Mathematica Menu Item)

Screen Environment determines which style environment to use for onscreen display.

InputAliases (Built-in Mathematica Symbol)

InputAliases is an option for cells and notebooks which specifies additional Esc\[ThinSpace]name\[ThinSpace]Esc aliases to be allowed on input.

ActiveInputAliases (Notation Package Symbol)

ActiveInputAliases[] returns a list of all active aliases in the current notebook. ActiveInputAliases[notebook] returns a list of all active aliases in the notebook notebook.

File > New > Demonstration (Mathematica Menu Item)

Demonstration creates a new Demonstration notebook.

File > New > Slide Show (Mathematica Menu Item)

Slide Show creates a new slide show notebook.

Help Menu (Mathematica Guide)