How to develop an existed project on another computer?

I created my project by `npx gatsby new my-carbon-site https://github.com/carbon-design-system/gatsby-starter-carbon-theme`
But when I tried to develop it on another computer, I ran `npm install` or `yarn install`, many warning and error appeared, I was wondering how to fix these issues.
And I also want to know how to keep up with the newest carbon theme, Thank you.
