Help making basic theme edits

Hi there! Originally my site looked like this: https://i.imgur.com/Bdpw3CJ.png and my goal was to extend the page defined in wordpress as the home page, so in an effort to remove the sidebar in "sidebar.php" I changed "<aside class="sidebar sidebar-primary widget-area" role="complementary">" to simply "</aside>" This brought me closer to my goal, but I'm still facing two small issues seen here: https://i.imgur.com/jZtbKyl.png 1: I'd like the page that's set as the home page to stretch the whole width of the page, currently it's still stuck as if that sidebar was still there. 2: The link from the sidebar originally on the right side of the page, has moved to the bottom of the page. How could I remove this section?