And for the forum, I use it for information if I want to get any info on bitcointalk. I know most of the sections and how they work but I never post anything because I always thought I will get banned or something if I post any irrelevant post.
Why thinking of getting banned when you can differentiate between relevant and irrelevant posts? Nobody will ban you if you follow Forum rules and posting etiquettes. I'm pretty sure with your time spent so far in the forum, you're familiar with its rules already. Those posting regularly are not in any way better than you mate. Do away with that thought of getting ban and start contributing meaningful to the forum.