Best place to begin
Start with The Wren House
If you are new to parser games, this is the easiest way into the site. The Wren House is a smaller side mystery built to teach movement, clue-finding, searching, object use, and puzzle logic through a real little adventure instead of a dry lesson.
You still get an actual story, an actual place to explore, and an actual mystery to work through. It just teaches the parser in a tighter space before you step into the larger games on the site.
good first commands: look, examine, open, read, search, inventory, use
what you will practice: movement, object interaction, clue-reading, hidden spaces, and puzzle logic
Then come back to the guide below if you want a clearer breakdown of how parser play works.