Hello, So If I developed a website for a client and had the code
already written what can I use for them to login their website to
make changes and stuff without having to work with code?
That will work but you will need to integrate your current design into a Wordpress theme. Authentication and editing capabilities should have been scoped out before the website was developed since they have a major impact on the project.
There are other CMSs like Perch that can easily be integrated into an existing site without having to rebuild the site.
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Check CouchCMS too http://www.couchcms.com/
About WordPress Theme Development, you will need a PHP experience and experience with WordPress - Understanding how it works, hooks, actions, APIs etc.
All is pretty well documented on WordPress Codex, and there are bunch of additional tutorials.
any links to where you are talking about would be good if any?
Basically this http://underscores.me/ + Codex help me to understand how to make WordPress Theme.
Search on YouTube simply
https://www.youtube.com/results?search_query=wordpress+theme+development+tutorial
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With using PHP and stuff?
I don’t understand the question.
I mean tutorials of using wordpress.org including the use of php, and customizing
a wordpress theme.
what does this website do exactly?
Generate a starter theme (skeleton, plain theme) for WordPress.
So what do I type in this field?
A sequence of alpha-numeric characters and underscore(s),
What you want 
Basically, I always choose a Advanced Options
And when you press “Generate”, theme would be downloaded.
what is it generating though? a wordpress theme files?
Yes.As I said