Anyone here know woodworking?

I don't recall any of the sliding miter saws I've use that allow partial depth cuts like you'ld want for making lap joints. You can do that with a circular saw if you're careful.

Combination molding planes are good and bad. The downsides are that they require additional setup and generally provide less support (harder to control).
A good plough and rabbet plane is a little different animal. They provide good support. Just be careful extra careful as the blade sticks out the edge a hair.

Combo plane (can't lie - I have two) is pretty good for beads on stragiht grains, more difficult for ovolos and in this case, cutting the rabbet and sash ovolo at the same time.
upload_2020-3-15_12-17-24.png

upload_2020-3-15_12-19-46.png

Of the people who have you tube videos up, Paul Sellers is the one guy I'd look at for hand tools info. He was/is an experienced fine woodworker first, including architectural work.