Rear wheel with wheel nut very hard to unscrew but I'm new to biking and repairs itself. I have a bike that has a wheel nut for its real wheel and I need to change the tire because of a flat. However, turning the nut didn't work, as in the nut was almost as if it was bolted onto it. I am currently using an adjustable wrench (one with the scrolling screw in the middle), and I have a lot of trouble getting it to turn even the slightest. Heard a regular rigid 15mm wrench might work, but I am not exactly sure. Any ideas on how to unscrew it and change the flat? Thank you very much in advance! :)

Sounds like your bike rear axle has a bolt-on axle, with a pair of 15mm hex nuts holding it in place.

The best tool for the job is either a 15mm ring spanner or a 15mm 6 sided socket. When I had an alfine gearbox I kept a light 15mm ringspanner in the bike's toolkit and its better AND lighter than an adjustable.

An adjustable spanner tends to have a little flex and will round-over the flats on the nut if its too tight.

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For added lightness you can even cut off the open-end and just carry the ring part and the handle.