What would be the top things you would advise on or suggest to someone whos thinking of buying BTC?
Mine would probably be;
1 Before investing, spend time learning about cryptocurrencies and blockchain in general
2 Dont look at it as get rich quick scheme, but as a long investment
3 Learn ways to keep your bitcoin safe and secure.
I think all your answers are the most common answer to anyone with a situation like that. Anyone who has experienced trading or investing more or less than a year in this market would still give the same advice because they've witnessed the others or their own mistake when they go full time. So I would do the same but perhaps I will add things like you must be prepared to loss and also don't put everything on it liek your life savings.
Indeed, every experienced person always advises these things when someone wants to invest in bitcoin but most of them ignore these advice, they only trust the information they hear from others, thinking of investing in bitcoin is simple and this is a quick way to get rich, lack of knowledge and consequences are unnecessary losses. So if anyone thinks about investing in bitcoin, I would probably advise them to ignore the rumors, spend more time reading information, identify the correct source of information, instead of garbage, and not rushing.