2. Don't Buy at the Peak, Buy during a crash like now, so you can Sell at the Peak like $70,000.
This is definitely not a "key" rule, both with investing and with trading. If there's enough momentum, sometimes buying at the peak is the right move. Heck, an asset(crypto or not) breaking all-time highs
can actually even be a buy signal.
5. Belong to a Community. Crypto works better if you belong to a Community where you are updated, especially on What to Buy, When to Buy and how much to Sell.
It can make things more fun, but definitely not a "key" either.