What's the best way to keep our accounts secure. I had this issue few years ago when someone logged into my account and scammed someone. This happened at night and in the morning when I saw emails about some transaction, I logged in right away and changed the password. There must be a simple way to secure account?
If you are talking about bitcointalk forum account, than you should first use unique strong password that was never used before for any other account.
I would also choose new email account, or sub-account that is dedicated only for this purpose and it should have 2fa protection, maybe Proton mail would be good.
You can also sign a message with your Bitcoin address that proves ownership of address and account connected with it.
Most important thing is to never click on any links received in forum personal messages, even if it's coming from established members, to avoid phishing attacks.