What is best way to deal with login credentials in web or android applications?

Hi there

I am working on an application where there is a section for user verification(UserId and Password)
my question is how should I Implement it in my application

1)Should I directly select purecode from my database and send it to my application and check there

2)Should I use some mechanism called keystore(I just heared it never used)?

What should I use to consider for security in applications(Web,Android)?


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