Type in your LaTeX source: GUI or your favourite editor. . .

White space:

• single space same as many;
• blank line is new paragraph (except verbatim mode).

Macros and Curly Brackets (Braces)

• macros (commands) control format: \macro
• braces (curly brackets), control grouping: {\bf this will be bold} or \section{A Section Title}

Example Document

• input source — line-by-line. . .
  • log
• output: PDF (Postscript).