Theme (Hatch) How to layout photos in a grid?

I’m new to WordPress and I do not understand code or the technical terms yet. I’ve installed the Hatch theme to create a photography website. Just a few questions:

I’ve created a menu and when I click on it when I am on the site, the photos are displayed in a diagonal line. I’d like to have them displayed in a grid format and I’d like to add more photos there too.

Once I’ve done that, how would I create a link on each photo so that when clicked on the photo is shown full side and, if possible on a different tab on a web browser?

How can I add a note at the bottom of my site saying ‘copyright’ etc? So that it is just above the text that says ‘Blog at WordPress.com’ etc?

Comments: How can I disable them on every page and post? I’ve disabled them on the pages I’ve created but the comment box still appears on posts…

Thank you!

Also, how do I create/add a logo on the top left corner of my site which will be visible on every page/post I create?