Merry Christmas to all of you. Based on what I have seen in my 3-4 months stint here at FinTwit, here would be my year end advice:
1) Do your own DD. Invest the time. Do not follow a trade just because a FinTwit guy with a ton of followers said that.

2.) I have seen by looking at tweets on stocks that a lot of FinTwit do not invest the time to understand a stock deeply. This is critically important for you, if you want to be successful over long term.

3.) It is not possible to do DD on all key stocks. So having a process to do DD is important even if you are full time or part time investor. I do this full time and I still find it difficult to keep up. So use as many tools , data, reports as possible

4.) Finally, if you are starting your DD and you find it really interesting but not a full conviction, then take a small position ( like 0.5% of portfolio size). This will make you twice more passionate in your DD as now you have a stake in the outcome.

5) Once you have conviction, you increase your stake based on your risk appetite ( or how much you can afford to lose if your thesis goes wrong, you won't be correct every time no matter if you have spent hundreds of hours in your DD). See more in next point

6) A dangerous practice is staking a lot more of your portfolio on one thesis. I have done that in initial days and many do it still. Thesis ( no matter what your IQ or experience) can "always" go wrong. If you put 50% of your portfolio in one stock, know that you can lose a lot.

7) Losing lot of money may set you back by several years. So focus on portfolio sizing based on risk and not on profit expectation. Happy Investing and let's hope for a great 2021.