For anyone browsing Malachain, here is a clear starting point on the subject.
Most people reuse a handful of passwords because remembering dozens of unique ones is impossible. A password manager removes that problem: it generates a long random password for every site, stores it encrypted, and fills it in when you need it. You remember one strong master phrase and the software remembers everything else, on your phone and your computer.
The switch takes an afternoon. Install the manager, import the passwords your browser already saved, then change the important ones first: email, banking, shopping and anything linked to a card. Turn on two-step verification for the manager itself and write the recovery key on paper somewhere safe. From then on, every new account gets a fresh password without any effort.
It also helps to talk the subject through with friends or colleagues who have tried something similar. Their experience points out the details that guides leave out: how long things really take, which costs were unexpected, and which shortcuts turned out to be a mistake.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.