use below two links to download,

https://nodejs.org/en/download/

https://git-scm.com/download/mac

after installation, open the terminal on Mac,

Alright, we are half way through this, now, create a folder called blog somewhere on the Mac.

Go to that folder on your terminal by, cd 'folder structure', then type in

npm install hexo -g

After this, type in hexo -v to check installation

Then type in below command in orders one by one, the local server will start

npm install, hexo g, hexo s

if you have problem installing those, type use sudo in front of these commands.