How else to secure VPS for beginners besides fail2ban, ufw, iptables?

Question

Information Security

I found the designated one here https://yareg.com/linux/zashchita-vps-ot-nechisti-...
www.juev.org/2010/10/09/bezopasnost-vps-servera
there is also about ssh protection here: habrahabr.ru/post/186362
and what else does a beginner need to close up the entrance to the server to all sorts of bots?

Answer 1

iptables is still powerful

Answer 2

disable ping on vps.
change the ssh port
to leave only key entry.