The first video shows a Japanese style saw I've not heard of before in use.
That looks like a very good one person saw for heavy work.
The second video is making small saw horses.
When I first started wood working I had a few tools and worked in my parent's car port or patio. My next project is going to be too heavy to carry up stairs so I am going to be working in our garage. The circle of saw dust goes around and around. It is wonderful to have a shop, and tonnes of tools, it isn't absolutely necessary if you have desire and a flexible back.