How to integrate facebook,google login to my website.?

for Google

Integrating Google Sign-In into your web app

Create a Google Developers Console project and client ID.

Load the Google Platform Library

You must include the Google Platform Library on your web pages that integrate Google Sign-In.

Specify your app's client ID

Specify the client ID you created for your app in the Google Developers Console with the google-signin-client_id meta element.

Note: You can also specify your app's client ID with the client_id parameter of the gapi.auth2.init() method.

Add a Google Sign-In button

The easiest way to add a Google Sign-In button to your site is to use an automatically rendered sign-in button. With only a few lines of code, you can add a button that automatically configures itself to have the appropriate text, logo, and colors for the sign-in state of the user and the scopes you request.

To create a Google Sign-In button that uses the default settings, add a div element with the class g-signin2 to your sign-in page: