Login Signup in Aem

Hi Team, 

I am new to the Aem developer community and to Aem as well, 

I want to learn the complete Login Signup feature of any AEM Site and its redirections if a user is not signed up!

So I am looking for the best approach to achieve a login signup feature for an AEM Site and seeking guidance from experienced ones, It would be great if any of you mentioned in detail and complete the steps to achieve this. 

Any help would be appreciated.

Thanks in advance 

Regards

Partyush(SDE)