1) NEVER DEAL WITH A PERSON WHO DON'T HAS ANY REPUTATION
2) ALWAYS TRADE WITH A PERSON WHO HAS POSITIVE RATING
3) DON'T INVEST IN ANY BTC DOUBLES SITES ALL ARE SCAM
4) THINK BEFORE HOW THEY WILL GIVE U MORE MONEY WHATS THERE PROFIT IN THAT NO ONE WILL GIVE U FREE BTC OR MORE
5) 80 % OF MINING SITES ARE SCAMS AND FRAUD THEY MAKE MONEY FROM US GIVES 1 TO 3 YEARS CONTRACTS AND CLOSE THERE ACCOUNTS SAYING THEY GOT HACKED
6) ABOUT DEALING ON bitcointalk ALWAYS DO VIA ESCROW OR AN MIDDLE MAN WHO HAS GOOD REPUTATION
7) NEVER STORE UR BTC ON ONLINE WALLERS LIKE LOCALBITCOINS OR ANY TRADING PLATFORM AND ALWAYS USE TWO WAY PROTECTION
8 ) NEVER EVER SHARE YOUR ID PROOFS TO ANY OF YOUR FRIEND OR NEVER SHARE EMAIL IDS KEEP YOUR PASSWORDS STRONGEST
9) MOST IMPORTANT POINT TO DO IS BEFORE INVESTING ANYWHERE OR BEFORE DEALING DO RESEARCH ON GOOGLE
Hopping all this tips will help most of new comers in bitcoin community also if more points you need to add or wana suggest then do write below
cheers ! be safe ...