If you use a smartphone and/or computer, you most likely have accounts with Google, Apple, and/or Microsoft along with numerous online services and subscriptions. Remembering the name or email address you used and the password for each account can quickly become overwhelming or impossible!
To solve this problem and also create safe and strong passwords, I recommend using password manager software. Despite some recent news, I use LastPass on all my devices and wouldn't hesitate to recommend it. However, your security is your responsibility so please do some research and choose a solution that works for the devices you use!