You need to have a Facebook Business Manager account, to manage ads and also to create and moderate Pixels. To create an account: https://business.facebook.com/overview
After creating an account, go to the Event Manager. From there you can create a Pixel.
You can create a Pixel for your site, for the platform, etc.
To do this you need to click on "Add Pixel", then a banner will appear with three possibilities:
Link your Pixel to your site
Link your Pixel to your application
Link your Pixel Offline
Choose the Pixel to your site.
This pop up then appears displaying 3 options:
Choose one of the two options, we recommend the partner integration because it is easier.
You will then have this banner displayed:
Then instructions will be given according to the partner chosen and you can analyse your site's data with a few clicks.
You can also install the pixel code in all <head> of your site. If you have an agency or webmaster, you can also send with "Send instructions by email".