Auto Hot Key
AHK Notion
AHK Usages
Keys
List of Keys (Keyboard, Mouse and Joystick)
LButton The left mouse button when used with Send, but the primary mouse button when used with hotkeys. In other words, if the user has swapped the buttons via system settings, LButton:: is physically activated by clicking the right mouse button, but Send {LButton} performs the same as physically clicking the left button.
https://www.autohotkey.com/docs/KeyList.htm#mouse-general
Variables
Variables and Expressions
See Variables for general explanation and details about how variables work. Storing values in variables: To store a string or number in a variable, there are two methods: legacy and expression. The legacy method uses the equal sign operator (=) to assign unquoted literal strings or variables enclosed in percent signs.
https://www.autohotkey.com/docs/Variables.htm#ThisHotkey

Seong-lae Cho