I myself sometimes forget the passwords that I created recently, because nowadays everything has a password, you can get confused and even more because in some devices the sessions remain open and you don't use the password very often to open the session.

My mother, may she rest in peace, also forgot everything, but she had something that I didn't, she had a notebook that only she and I knew where it was saved, where she wrote down all those passwords among other important things.

Lastly, I think you see the Samsung setup complicated because you are an iPhone user which has another operating system. Me, being an Android user, I become an etcetera using an iPhone.