Is it possible to keep your blog or forum secure from hackers so they can't corrupt your databases or access sensitive member info? What are some of the precautions you are using now for this purpose?
In my experience it is extreemely difficult to keep unwanted persons/bots away. Regarding hackers we pretty much need to believe that the programmers of forum software doesn't leave too many backdoors open and that the signup/signin is pretty intelligent.
The first tip is don't used nulled anything. People think they can get something for free through means of nulled development only to find out that they get hacked through secret back doors in the process.
Always keep backups and always keep the software up to date.
I just rename my admin directory to something random like 'gfffsdsgjfhf' and bookmark the link. I also set up a strong password for the admin account so that it take at least 80 years for hacker to crack it using brute force attack. I backup my database each and every day, so that if, by any chance, my forum is hacked, I can easily recover without losing much posts. I am using MyBB and I regularly use it's file verification system to see if any of the files are changed. I make someone moderator or admin after completely verifying them.