Facebook never disables accounts for no reason or for the fun of it.
Some examples include:
• Posting content that doesn't follow the Facebook Terms
• Using a fake name or not using your full real name.
• Creating two accounts.
• Impersonating someone
• Continuing behaviour that's not allowed on Facebook by violating the Community Standards
Read Facebook terms and community standards carefully.
If you think your account was disabled by mistake, you must appeal Facebook's decision.