It's nearly impossible to "build" a laptop, thats more for PC's. If you want a good laptop for $500 or under, check out Asus brand but if you want something a bit more pricy look into Alienware
Most macs actually have a built in screen recorder/ audio recorder. Search up "Quicktime Player" in finder or look for it on your launch pad and you may find it I'm a youtuber with about 660 subscribers and the software works awesome with great quality.
