@Gina I got a cheapish Ryobi a long time ago and it has worked great. I used it to cut a dozen doors (to fit rhomboid doorframes in an old sagging house) among other things. Get some cheap sawhorses to enable cutting big things. Put a rag on top of them to prevent scratches.

Honestly my biggest problem is that the damn thing is so loud I developed a significant phobia of merely turning it on. So maybe get some ear protection too.

Also consider getting a hand planer to fix up little mistakes.