I like to type out a random set of numbers and letters and save them to a notepad. It's the best defense against brute force attacks. The bitcointalk hack that happened in 2015 wouldn't have been a problem for anyone if their passwords were good because all the passwords needed to be bruteforced.
The 2015 attack happened because the attacker managed to gain root access and steal the password hash.
Even if they use a strong password, that hash can still be bruteforced by the attacker, my original ID were one of its victim (although it is no longer active anymore)
honestly, it is still a problem whether you use strong password or not, when a site gets hacked you must change your password.
Another tips, you might want to get password manager like Keepass, saving your password on a notepad is bad idea.
How to secure spectre and meltown attack?
I thought those were Hardware based exploit ?
Microsoft already released a patch against those exploit, so it shouldn't be working as long as you have your windows updated.