How to Make WordPress Site Secure from Hackers?

[Jango]

Would like to know all possible way to make my WordPress site secure from hackers.
Are there any experts who can share their tips here?

One of my co-workers shared these ones:

Create WordPress Sites on FLATsite
Use TLS or SSL Certificates
Utilize DDOS Protection
Implement a Website Back-up

Have you tried FLATsite static wordpress site generator (https://flatsite.com/)? Is it really good solution?
So, could you share your view points on securing wordpress site from hackers?

Thanks.

[MorStone]

I am very pleased with the service provided by FLATsite.com!
You know, most attacks on WordPress websites target the database. Static websites have no database, which makes these attacks futile.