How to create push notifications on the site yourself?

Question

Push technologies

Good afternoon everyone, today I spent the whole day studying push notifications and how to make them myself, I also found a lot of services for them, but I don’t want to use the services because, firstly, it’s the collection of personal data, and the same site, and secondly, it’s all paid as there are push limits for services!
I found 2 links for developing push HC:
https://developers.google.com/web/fundamentals/cod...
https://developers.google.com/web/updates/2015/03/...
Can someone tell me how best to make push notifications? That is, according to which manual is best + it is necessary for the desktop version and the mobile version of the site!

Answer 1

I advise you to take ready-made because it will be difficult to write yourself

Answer 2

There is a Altpush.io service. You do not need to program anything, you can try for 30 days and the minimum paid tariff is 10 bucks.