Always be a student of the market.

I hope this instills a sense of humbleness among the participants of the stock market. It's easy to become arrogant when you have probably spent only 0-5 years in the market and reaped consistent profits on your portfolio.
The urge to give advice and opinion becomes strong when you are making money,. particularly in a market like this. Every news, tweet, investment thesis reinforce your positive bias.

Remember- Every time a buyer buys a stock, the seller sells it but both of them think they are clever.