Clarified and padded out most paragraphs

[encinoman1]

I updated, clarified and padded out several paragraphs to make the topic more accessible and informative for a novice.

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)
• My pull request targets the master branch of freeCodeCamp.
• None of my changes are plagiarized from another source without proper attribution.
• My article does not contain shortened URLs or affiliate links.

If your pull request closes a GitHub issue, replace the XXXXX below with the issue number.

Closes #XXXXX

[cmccormack]

Looks good to me, and congratulations on your first Pull Request! 🎉🎉🎉
We look forward to future contributions!