NEW TO OC

* I need to upgrade OC - what issues/coding script errors will this cause?

What's the current version of your OpenCart?

* I need to customize a template - what is the easiest way to do so?

Start by reading this: http://docs.opencart.com/developer/module/

* I have a PHP diploma - what is this module thing and where is the best place to learn?
PHP Diploma? What do you mean by that?

JaimeLM wrote: ↑

Wed Mar 08, 2017 3:07 pm

* I need to upgrade OC - what issues/coding script errors will this cause?

That depends on your current OC version. But in short, OC upgrade code is pretty bad comparing to other frameworks. You'll have to do a lot of things manually.

JaimeLM wrote: ↑

Wed Mar 08, 2017 3:07 pm

* I need to customize a template - what is the easiest way to do so?

You always start customizing template with its settings, then CSS. It is wise to avoid changing template's code as much as possible - very upgrade unfriendly.

JaimeLM wrote: ↑

Wed Mar 08, 2017 3:07 pm

* I have a PHP diploma - what is this module thing and where is the best place to learn?

In most frameworks modules is the same thing: some kind of section to display info. For example, tag cloud. RJ already gave you a link to module development page - it'll give you more info.

I suggest your should try tutorial point to learn OC.