A: Hi,
1. Yes you can. It's just a users table you need to create with columns like name, email and password (and any additional fields you wanna have). You will get an API immediately to fetch data from this table and post data into this table. Now, you need to integrate this api into your frontend to implement the user auth.
2. Data is stored as plain text at the moment. But we will be implementing hashing algorithm to encrypt any data.

Thanks
Riya