Here's a play by play of kenorb's answer to 'How to clone all repos at once from GitHub?' with a breakdown for each command for people (like me) new to bash
TL;DR Run the following command, but replace Kylemit your own Github user name
UserName=Kylemit; \
curl -s https://api.github.com/users/$UserName/repos?per_page=1000 |\
jq -r '.[]|.clone_url' |\
xargs -L1 git clone