Err, Recommended Dimensions?

Hello all!

I just downloaded this theme and was combing through the documentation, as well as the forums on the Mageewp website and I couldn’t help but notice that they both lack simple details, like the ideal sizes/dimensions for:

> The logo;

> YouTube background videos (since these videos always seem to have the bottom cut off, as if the video had been zoomed in);

> ALL background images:
– I know I’ll be looking to have one, solid image as a background for one of the sections, as opposed to a small image that is repeated. So what size do I make my image, ideally? Does this theme automatically adjust background images to fit larger/smaller screens/devices, or am I just better off repeating a small image?
– Does the ‘Post and Page Background Image’ have to be long in height and thin, or is that just a design suggestion?

> And the slider images.

I… guess people have been determining these things through trial and error, but I was wondering if anybody could offer what they’ve found to be effective. Feel free to call me stupid if the answer to these questions are dead simple, but I’ve already seen plenty of people ask related questions and Mageewp hasn’t seen fit to provide a set of standard answers. So, yeah, if people compare notes, we can help each other out. ??