Web Notification

Question

Well, I searched for days on the web and couldn’t find a full tutorial or video lesson on how to do it :/ hope you stackoverflow here help me kkkk.

Well I need to create one of these notification systems like facebook, gmail, workana among other sites do, an example: when someone marks you on facebook appears a notification on the screen.

I’ve tried everything here kkk but it seems that my level on the subject did not help me to achieve success :/

tried with firebase - Socket.IO finally what I found ahead I was trying but without any success...

someone, here knows how to do this, and has a tutorial like: follow this who works lkkk

thank you!!!