What got them banned is likely either of plagiarism or sharing malwares or ban evasion (for users that were initally banned for any of the first two reasons). If you can avoid doing any of these you have a low chance of getting banned.
Is this forum strictly against plagiarism? then what if I quote a part of another website's sentence as a reference argument in the discussion? is it a violation?
The forum have zero tolerance for plagiarism and at that i advise you avoid anything of such to avoid getting your account banned, and if you must cite another person's work, then you must make sure that you properly have it referenced to the original content creator and never take responsibility for another person work in form of copy and pasting.
Making proper quote and including a link will go a long way in solving that issue if you have to post other people's work here.