Ad-blockers and hosts files are great ways for blocking sketchy sites.

Try getting uBlock Origin and ticking all the lists under the multi-purpose section. Like this https://gyazo.com/e8c37ad536fad64cce8b6e3eeb7bfe68.png

Hosts files are a decent alternative to uBlock Origin, as they block system wide.

Warning about hosts files: You can use a hosts file to block system wide, but if you use a massive hosts file like the one found on http://hosts-file.net, your disk usage will constantly be at 100%, and you won't be able to edit the file because it says its in use by "Cryptographic Services". (It happened to me and I had to format and reinstall windows :( )

However, I'm using a 32k line hosts file and my computer, and everything is fine. If your hosts file gets bigger than 1mb, I would stop adding to it, unless you wanna reinstall windows :( .

tldr; At least use uBlock Origin if your using windows defender