Looking to stop scrotes stealing my bike - both at home and when out and about - unfortunately they are too easy to steal

I know there is a few experienced bikers on here so was hoping to see what experiences you have with various products before I buy a fakely "5 star" reviewed lock off Amazon/similar site!

Anybody found any locks that make a decent impact on insurance premium?

Anybody had a lock that was so cr*p that there bike was taken?

Thanks all :D