I mean you have wikihow but it's not really high-quality all the way through.
There doesn't exist one guide. All of these topics are highly debatable, have different opinions with far different perspectives. Some things you just have to figure out yourself with the help given to you. Means: get as much info as possible, compare, talk to others, reflect on your own experience and expectations.
There is no "one better way" to do these common tasks. And many companies spend an insane amount of money to spread (mis)information on how best to eat, exercise, get to work, clean, dress, wash....
So I don't believe there's "objectively" one way to do anything.
Find your way.