Mathematica allows you to control font sizes of text, math, and graphics for clarity, compactness, or personal preference. You can choose styles for individual characters, ...
FileNameJoin[{"name_1", "name_2", ...}] joins the name_i together into a file name suitable for your current operating system.
LineIndent is an option for Style and Cell that specifies how many ems of indentation to add at the beginnings of lines for each level of nesting in an expression.
ToLowerCase[string] yields a string in which all letters have been converted to lowercase.
NotebookSelection[] represents the current selection in the current evaluation notebook in the front end.NotebookSelection[nb] represents the current selection associated ...
ToUpperCase[string] yields a string in which all letters have been converted to uppercase.
ExpressionCell[expr] gives an expression cell that can appear in a Mathematica notebook. ExpressionCell[expr, " style"] gives an expression cell with the specified style.
ContextToFileName["context"] gives the string specifying the file name that is by convention associated with a particular context.
DragAndDrop is a global front end option that specifies whether to allow drag-and-drop editing.