Horror isn’t my genre but…
The first Halloween is a classic. I saw it first time in my 20s and it still disturbed me, which is something I want from a horror movie. It is cinematically very well made.
I recently watched Hell Night starring Linda Blair, it was a good 80’s slasher film. I like low-budget horror films.
If you have 90’s nostalgia, besides Scream & Scream 2 (the rest are bad) I remember I Know What You Did Last Summer and its sequel with Jennifer Love Hewitt being fine popcorn horror movies.