Trading Plan
Written document defining what you trade, when, how, and what invalidates a setup.
Short. Specific. Pair, session, setup, risk%, stop rule, target rule, max daily loss, journal requirements. If it doesn't fit on one page, it's a wishlist, not a plan. The plan removes in-the-moment decisions. Decisions made calm are better.
Related
Learn to actually use Trading Plan.
Definitions are the easy part. The free first five modules put this on a real chart and make you do the work. No card required.