You should be using a password manager. My own digital life revolves around 1Password.
1Password has long been the best password manager for macOS but it's been making ground on Windows as well. In the last week or so, the folks at Agilebits who make 1Password released an update that allows 1Password to work with Microsoft Edge in Windows 10. Major good news.
William Porter is Rucksack's owner and principal. He's been writing on a range of tech subjects for three decades. Yikes!