how do I add a Login/sign up feature to my website

Question

plz answer

also, this is the 1000th post in "themes"

Comments

How did you Log in or Register to this website?

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Actually, after further reviewing I realized this should be marked as "Off-topic" instead of "Too Broad", as you're asking a question in general, and not one specifically in regards to Q2A.
How did you find out about this website by the way?

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We're both members of kidztalk, arguably the largest forum at the moment powered by q2a.

Check it here: https://www.kidzsearch.com/questions/

I've been a part of that site for like 6 years (I'm a mod now), and I like to show the other members this software, so forgive me if you get off topic questions, we're just curious :)

I've taken it upon myself to learn this software since I was 14 and you probably remember me.

His question is how to add a login system to a site in general.