The most important advice for newbie is about security. Be careful because there are a lot of phishing attempts. Secure your coins in wallets and be extra careful with your passwords and private keys.
And remember to do your own research when deciding in what to invest.
As a newbie like me. I am very careful of answering the question and too much learnd how to post. I'm very careful of my password of not letting others so that it will not hack.