I'm new to OC and am learning my way around this platform. I've been working with Zencart for almost 9 years and am tired of the old feel to it. I've installed OC's default out of the box site and it all looks and works well. I'm looking at certain themes available for free in the marketplace. Most of the themes and addon's don't mention if they overwrite the core files. Should I assume it's writing core files if it's not mentioned? I'm trying to get my site up and running with OC asap but don't want to screw things up while I move everything. Is there a place to find addons that do not overwrite the core files?
Opencart also provides the ability to create extensions (OCMod) which uses a buffer to propagate the desired features into the platform. However, the conflicted line of codes cannot be tracked unfortunately. There is also the Override Engine you could use to create extensions or even create your own extensions / modules by relying on already existing files from what's been already delivered from the core. Opencart does not use overrides such as Zen-Cart.
The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.