Categorizing Code

[Crice]

I am curious if we have any website design people. I need help properly categorizing my code so our clients can visit our website. 

I read this article and understand what categorizing is and why companies use it. How the heck do I fix it? Is it easy or do I need to hire a pro?
https://www.observeit.com/blog/website-c...explained/


Thank in advance!