I need help with …. everything

Hello,

First sorry for having like close to 0 knowledge but i need help with the following. Its so basic things and once i learn them i will be good.

My website : http://www.savantsgaming.com

1. How do i edit the sidebar, first of all this Next Clan Matches ? I want to add my own content there, like images and text.
Can you please advice me like for a noob how to do it step by step? I get lost very quickly for the moment with this theme.

2. Where can i find the option to edit the text from the header under the pages bar ?
This text :
CREATE AND MANAGE
TEAM MATCHES

Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil
impedit quo minus id quod maxime placeat facere possimus.

3. Why Latest Posts widget from sidebar doesnt show my last post about “Next Project : La2Dream” that is a post? How do i add what i want there? How i get to this option?

4. About font of my website, how can i change it exactly? Can you write me the steps exactly so i know how to reach to this option?

5. How can i add in my sidebar my discord channel like this website has ?

Home portfolio

Cant thank you enough !