Creating a strong password for every website that you use is the essential first step in secure online behaviour.
This advice from UK Gov’t is at first glance very good advice. But it implies that you only need different secure passwords for a few important online accounts, Your email, your bank and Social media. I disagree with this and you need a strong, secure, different password for EVERY single online account. That includes all online shopping, forums, blogs, Government sites,etc. You name it, If it uses a password then you need a separate password for each and everyone of them.
Most compromised accounts nowadays don’t come from somebody guessing a commonly used or simple password. Yes! that still happens, but the vast majority are happening due to a site being hacked / compromised and exploited and the user names and passwords stolen and used in other attacks. See a few of Troy Hunt’s posts about password re-use.   and check your details on https://haveibeenpwned.com/ Far too many user names & the same password appear in multiple breaches.
Many of us will have upwards of 50 online accounts or logins on our computers and, mobile phones and other devices. Nobody can remember more than 2 or 3 separate passwords, or which password corresponds with which log in or device. The only way is to use a password manager to create and store strong, secure, safe log in passwords.
You can chose which one, you want or find easiest to use. BUT use it. I have tried various over the years but always come back to using RoboForm myself. I suppose it is what you find easiest to use. The layout suits me and it works. Many Anti-viruses or security suites include a password manager addon in their offerings.
I am not a great believer in cloud based password managers. I prefer all my details on my device, not on a remote website where it “could” be hacked or misused or compelled to be revealed by a Government agency. Use a master password to protect the password manager. Back up the password file in its encrypted state to a CD/DVD or thumb drive regularly and keep that in a totally safe place.