Thick orange lines are main SR ( ) levels.
Thin orange lines are 50% levels that can also act as SR.
Basic Strategy is:
buy on green level, sell on red level.
Never sell in buy area (between main SR and green level).
Never buy in sell area (between main SR and red level).
You can find HODL SR on TradingView. Complete info, docs, examples & screencasts: hodl.org