[Python] Flask Login system

I've just started with flask development and wanted to know if I am going about it the right way.

I basically want to build a login page with Flask.

What I understand is:

1. Make the webapp using flask. I serve the HTML template which is actually my login page.
2. The user enters the details in the login form.

Where do I go from here? How do I proceed? I have the username and the password but how do I check the credentials from a database?

The code that I have is given below:

from flask import Flask
from flask import render_template

app = Flask(__name__)

@app.route('/')
def hello_world():
return 'Hello World!'

@app.route('/hello')
def hello():
return render_template('hello.html')

if __name__ == '__main__':
app.run(debug=True)


This is the flask file code. The HTML code is given below:

<html>
<body>
<form name="login" method="post">
Username:<input type="text" name=username required placeholder="Username"><br>
Password:<input type="password" name=pwd required placeholder="Password"><br>
<input type="submit" value="Login">
</form>
<button
</body>
</html>


How do I proceed?

I am sorry that I am naive on both the web-dev part and flask but both are new to me.

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