I generally use https://www.npmjs.com/package/http-server to run my local web server. http-server works really great, however lately I've been finding myself using SimpleHTTPServer because it's already installed on my Mac and it's, well... simple (obviously, given the name).
Open terminal.app and run
cd ~/Sites/some-project (or wherever your static project files exist)
and now fire it up:
python -m SimpleHTTPServer 8000 (or choose another port number)
then simply visit http://localhost:8000 :)