The tool that makes this workable.
WHAT IT DOES
Generates unique passwords Stores them encrypted Fills them in when needed
WHY IT IS NECESSARY
Nobody can remember dozens of unique long passwords.
Without a manager, people reuse or write them down insecurely.
WHAT YOU NEED TO REMEMBER
One strong master password.
That one must be long and unique.
WHAT TO PROTECT IT WITH
Two-factor authentication on the manager itself.
WHAT PEOPLE WORRY ABOUT
Putting all passwords in one place.
THE HONEST ANSWER
The alternative is reuse, which is worse.
A reputable manager is far safer than reused passwords.
WHAT TO CHECK BEFORE CHOOSING ONE
That it is established and reputable That it works on your devices That you can export your data What happens if you forget the master password
THAT LAST POINT
Usually nothing can be recovered. Store recovery information safely.
WHAT TO DO FIRST
Install one, then change your most important passwords to generated ones.