another good suggestion is to stay away from scam website such as bitcoin . com that would dump an altcoin on you and call it bitcoin.
OP, I think that this should be added in a way or another, but with big fonts and colors, to the first post.
Since bitcoin . com keeps advertising that their altcoin is the true Bitcoin, newbies will keep getting fooled and many of them will also send those to Bitcoin addresses.
(Though unfortunately in many cases they also come here only after making the mistake.)