In terms of best performance, circular saws can be used to cut several materials. Some of the materials which it cut best are.
Hardwood lumber and softwood lumber
Plywood and Manufactured panels
Laminated flooring
Wood siding
There are many more things which circular saws could cut. There are many types of saws which you can use for your work. You can look at their specs if you want: https://www.trustsaw.com