[Support request] Adding Text To Category Pages

Hey! So I want to have categories showing the Breakfast, Lunch, Dinner posts via here: https://wordpress-623989-2435274.cloudwaysapps.com/index.php/category/breakfast/ and I’ve set up the pages to show the posts in that category which is great. What I’d ideally like to do is just be able to change the title or add some text below the category page so it then makes sense that it’s “Breakfast Made Easy” as it’s a food blog called “Made Easy With Ell.” I can’t work out how to do that however, so:

1) Could you tell me if it’s possible to do it this way please?
2) If not, I’ve just tried to recreate it via a page, however the sidebar layout isn’t the same – the spacing doesn’t fit right. Why is this and what would I need to do? And then second from that, if I want it to show all the breakfast posts, do I do that via the Showposts and is it possible for it to always show all the posts with no limit to how many that show up in there? Page for reference: https://wordpress-623989-2435274.cloudwaysapps.com/index.php/breakfast/

Thanks for your help,
Ella