On macOS:
for the security stuff, run the command in the terminal:
sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./sec/key.pem -out ./sec/cert.pem
Windows is the same but without sudo, if you have openssl installed
install https://code.visualstudio.com/ & https://nodejs.org/en/
install npm in terminal: sudo npm install
install yarn in VS Code terminal: yarn install
start localhost: yarn start (try sudo yarn start if that doesn't work)
open https://localhost/ in chrome
if it doesn't work, try turning the firewall off
if you have issues saving or running stuff on mac, try:
sudo chown -R username directory_name