needing help to create my wordpress theme

Hi there, I am working on creating my own WordPress theme for my website. I am currently in the works of moving my website to WordPress (currently this is it so far). I have made a start by moving my cleaned up CSS, some of the clean HTML to my WordPress folder structure. I have been following along here and have been having a look here. I have managed to set up a basic folder structure and some basic files for my WordPress theme which can be seen at my linked GitLab repository. So far I have just the basics. I can display a page with CSS. However, I’m trying to work out how to get the header and footer PHP files to show up. As, as far as I can see, all the PHP files code is correct and with no errors, but I don’t get any of the headers or footers showing when being viewed. I have set up WordPress locally on my pc and works fine using WampServer. I have absolutely no idea why it’s not working or which bit is doing what. As far as I can tell, you put in the header HTML code into the header.php file and the footer code into the footer.php file and I can view them fine in Dreamweaver and as a webpage, but don’t know why WordPress, isn’t picking them up even though the PHP code is correct. I have built my own website using HTML, CSS and a bit of javascript thanks to w3schools. but I’m the ideas and designer dude, not the PHP coder. Any coding help would be kindly appreciated.

The page I need help with: [log in to see the link]