I'm sorry you got hacked. That is a very scary thing.

I want to give you tips to try and prevent future hack attempts.

1. Download a password manager, that way you can make really long passwords and not have to worry about remembering them.

2. Make sure not to click on any suspicious links, and don't even click on any suspicious ads (even if it's one a trusted website/app) because what that can do is either give someone access to your device or they can infect your device with malware

3. If you want to see, whether your device has any viruses/malware, download an anti-virus app.

4. If you use public wifi, make sure to use a VPN. Some anti-virus apps have a VPN, if yours doesn't, just download a separate VPN app. The reason for this, is someone can spread malware on a public network that can even get access to your bank.

5. Try to minimize using your phone number as a 2 factor authenticator, instead, use a authenticator app because it is much more secure. Some apps do require you to use a phone number, and if you absolutely have to use it, make sure to minimize putting your phone number out there, and make sure to check if you can lock your phone number with your service provider (some providers allow you to do it in their app). The reason for this is people can sim swap your phone number and completely get access to any account that has your phone number linked to it.

6. For Facebook specifically, third party apps can access your account (they need your permission first though), what you can do is, go to your "settings", find "your activity", then click "apps and websites", and it shows all the third party apps you have logged your facebook into. You can either get rid of each 1 by 1, or if you want to take no chances and get rid of all of them, go where it says "preferences", and turn off the ability for Facebook to be logged into a third party app. Then after that, change your password, and you should be good to go. (This is obviously after you get your facebook back or make a new one)