Font of titles, Hover color, Header clickable, FB box and more

Hi guys,

My site: https://ilesieda.pl/

First of all I must point out I’m a complete CSS/PHP/Wodrpress etc. newbie. I’ve installed the theme (it’s gorgeous, thank you!), trying to personalize and configure it properly and I’m facing some problems. I’ve gone through the whole forum and still either haven’t found answers to some of my questions or the solutions provided didn’t work for me. Thus, my questions below. I’ll appreaciate your help very very much.

1) How do I change font of titles of posts?

2) Ho do I change the cover color of titles?

3) How do I make the header clickable and link to home page? I know it’s been discussed a few times here, but for some reasons all the solutions (including this one: https://www.ads-software.com/support/topic/change-header-text-to-header-image?replies=9) didn’t work at my page.

4) How can I add a Facebook like box next in the row of excerpt (as its fourth element)?

5) How do I move the Continue reading button to right?

6) How do I change font size of excerpts of sticky posts – the ones in a row below the feautred one?

Once again: I’ll greatly appreaciate your hope. Oh and please don’t get offended by pictures used at the page – it’s just for testing.

Thanks very much in advance!