ST Format was my first regular buy - I don’t remember buying anything for my Amstrad CPC464 but ST Format got me really looking at games and being more aware of what was coming.
They also got me into programming properly with cover disks with STOS and GFA basic on them and things like the Bitmap Brothers doing Assembler tutorials, where previously I’d mucked about on my Amstrad (I’d have been about 8 so my code wasn’t hugely sophisticated but it wasn’t bad for my age).
I have a thread the ST Format Challenge
https://www.neogaf.com/threads/the-st-format-challenge.1533843/ for anyone interested in that kind of thing.
Once I got my first PC in 1996 I stopped getting magazines for a while but eventually settled on PC Zone. It was awesome. Helped by amazing games coming out with incredible frequency in the late 90s the magazine had wonderful writing and that 90s edge that’s missing today.
To anyone on this thread, I recommend going to archive.org as they have a huge selection of old gaming magazines.