My smartphone is nailed down.. Now I need to do the same to my laptop. Advice needed please

Hi - I use (OFFTIME) PRO to severely cut back on my Android phone functionality. OFFTIME allows me to use apps such as Meetup, Google Maps, Whatsapp etc etc but I'm not allowed to use a browser which would give me openended access to the internet.

I've got used to (OFFTIME) refusing to allow me to bypass the rules unless I wait a minute to countdown, which is usually long enough for me to successfully question myself.

Now I need something like that for my laptop. It's in monochrome and I've got apps that severely restrict Facebook and Youtube in Chrome.

But I really need something a bit more like (OFFTIME) which puts some pretty serious obstacles in the way of openended internet browsing.

Can anyone suggest a strategy to cut down on openended browsing on my laptop? I must admit that I have a bad habit of avoiding my Chrome rules and going over to Edge, the Microsoft browser instead.

What would be good would be to have (a) whitelisted sites like meetup.com etc (b) some banned sites and (c) a time restriction on everything else.

Regards HC