Anyone who thinks the circular saw is just a saw that they can use freehand without worries is welcome to study some of these 600 accidents:
https://www.osha.gov/pls/imis/AccidentSearch.search?acc_keyword="Circular Saw"&keyword_list=on
An example:
[attachimg=1]
https://www.osha.gov/pls/imis/AccidentSearch.search?acc_keyword="Circular Saw"&keyword_list=on
An example:
[attachimg=1]