Doubt about starting a project by not using codepen. Can i use other editors like Visual studio or Brackets to create projects

Tell us what’s happening:

I was creating my first webpage challenge of freecodecamp. But its mentioned that we should use codepen.io for this or use a CDN link. I dont know what this CDN is about and how to use it . What i was asking is can we make our projects in other editors like Visual studio code or Brackets. Please help me out of this.

Your code so far

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36.

Challenge: Build a Tribute Page

Link to the challenge: