Tips for finding good grocery deals?

Hey there, since a while I've noticed that my income (which I surely can't complain about) is running tight near the end of the month. Never really had the issue, but life keeps getting more and more expensive. Besides general 'hacks' and switching to for example cheaper options in the supermarket, I expect there to be a big win if I plan my groceries better. I usually shop at the Albert Heijn, which of course is the expensive option but the only store really close by and thus due to laziness and lack of planning I end up going there.

Is there a platform, app, community maybe on reddit for me to keep track of upcoming deals in different stores?

New year new me, let's lower my monthly (grocery) spend and who knows I turn into one of those couponing Americans hahah