Stay away from contracts, stay away from counterfeits, stay away from on-exchange leverage, you can use off-exchange leverage because there won't be a liquidation. On-exchange leverage always has a risk of liquidation; returning to poverty can happen in an instant. When a black swan event occurs, you never know where it will strike. The reason I keep emphasizing this is that it's also a self-discipline, reminding myself to stay away from systemic risks.