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Selecting and Typing in Notebooks
Mathematica has many special features that optimize the entry and editing of both ordinary text and Mathematica input in notebooks.
Reference
Making Selections
double-click — select a word or function name
triple-click — select a function and its arguments
repeated clicking — continue expanding selection
Ctrl+. — expand selection within a cell or beyond
Ctrl+A — select a whole notebook
Brackets & Syntax
Help ► Why the Coloring? — find out why input is red or has other syntax coloring
Help & Command Completion
F1 — search for help on the name selected, or to the left
Shift+F1 — bring up a new instance of the help viewer
Ctrl+K — complete a command name, character name, etc.
Entering Styled Text
Alt+Enter — create a new cell of the same style as above
Alt+n — pick a style for a cell (4 for section heading, 7 for text, etc.)
Alt+0 — enter a style to use for a cell
Ctrl+B, Ctrl+I — toggle bold, italic
Alt++, Alt+- — make font larger, smaller
Entering Special Characters »
EscnameEsc — enter hundreds of special characters by short names
Math & Tabular Input »
(Ctrl+^ or Ctrl+6) ▪ 
(Ctrl+_) ▪ 
(Ctrl+/) ▪ ...
Ctrl+Space — move out of a script position
Ctrl+Comma, Ctrl+Return — create a 2D grid
Ctrl+(, Ctrl+) — start, end an inline math cell in text, or text in math
Typing Shortcuts
Delete — delete next character
Shift+
, Shift+
— extend selection back or forward
Ctrl+, Ctrl+ — skip back or forward a word
Ctrl+Shift+, Ctrl+Shift+ — extend selection back, forward a word
Cell Operations
, 
— move down or up inside or outside of cells
Ctrl+Shift+M, Ctrl+Shift+D — merge or divide cells
Ctrl+Shift+E — toggle to unformatted expression form of a cell
Shift+Alt+n — change cell style (4 for section heading, 7 for text, 9 for input, etc.)
