Make your passwords as long as possible. The longer the better. You don't need to go crazy with special characters. Just make them long and change them periodically. When possible, you should use two factor authentication.
Never log in using any open wifi. Ideally, don't use any wifi for banking, but that's not always possible.
Other than that, you should clear your hard drive once ever year or two. This isn't strictly necessary, but I'd you're not great around the computer it can be hard to find the problems. Easier to just wipe the whole thing.
Paid anti-virus is, in my opinion, a useless scam. Norton has been milking that cash cow for years.
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