Topic on Project:Support desk

I should begin with saying im completely unfamiliar with coding in HTML or anything that has to do with MediaWiki.

I have managed to install MediaWiki on Localhost (Im using Apache2 on an old linux laptop i recently got, its a miracle that i even managed that!)

I want to be able to arrange a wiki page as i wish (for example, Wikimedia's home page has an interesting format! I want to make something parralel to that) and also i want to be able to put these boxes that are found both in the MediaWiki website and Wikipedia itself, that are blue with an 'i' icon, or red with an '!' icon. I think i have also seen yellow boxes with a coresponding triangular symbol. (just to illustrate my unfamiliarity, i dont even know how these 3 are called.)

Any help will be extremely appreciated!

You are probably thinking of ambox - w:Template:Ambox. Manual:Importing Wikipedia infoboxes tutorial might be helpful but its not generally something i reccomend to new users.

As for layout, i would reccomend finding a CSS tutorial (a generic one, not mediawiki specific). E.g. https://developer.mozilla.org/en-US/docs/Learn/CSS/First_steps (if you dont like that one there are a lot of others on the internet)