The password is such a sensitive stuff that you can't write on a paper not somewhere in the computer, Someone might see that if you do. You might have an account on a bunch of sites and it's hard to remember each and every password from the websites. So, There are many applications, extensions or website that can remember your password securely. It basically encrypts your password so none else can see except you. LastPass is one of a well-known company that saves your password securely. Well, if you don't like the LastPass service or anything there are alternatives to that I will mention.
BitWarden is a free service of the password manager, That's because it is open source. BitWarden is more simple and easy to use compare to the LastPass. It encrypts the password that you put in and stores in their data, so only you can see the password. It also has Android and iOS app like LastPass to makes things easy to use.
KeePass is a free open source password manager, which helps you to manage your passwords in a secure way. You can put all your passwords in one database, which is locked with one master key or a key file. So you only have to remember one single master password or select the key file to unlock the whole database. The databases are encrypted using the best and most secure encryption algorithms currently known (AES and Twofish).
KeePass is really free, and more than that: it is open source (OSI certified). You can have a look at its full source and check whether the encryption algorithms are implemented correctly.
Just like the other password manager, it works same. But it supports fingerprint security in a mobile device, that's' pretty good. SafeInCloud is very easy to easy compared to any other manager mentioned above.
Enpass is a standalone app for your password manager. It doesn't matter which platform you use, Enpass is there for you.Enpass encrypts the data on your device with the strong AES-256 Encryption. The Enpass desktop app lets you automatically import your data from other password managers.