These are excellent selections of software to get you 99% of the way there on Linux. With these apps, you become armed with an excellent suite of tools for most modern day tasks, take a quick look at these:
KeePassXC is arguably my top recommendation for password managers, this gives you full control of your online accounts with only having to remember one master password. Stores your password database encrypted, locally on your machine. Consider saving a copy to a cloud if you need offsite backup.