How to upload code

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I’m relatively new to web design, I’ve been practicing on and off for a few years. I’ve written a couple ‘functioning’ sites in an IDE but I have no idea how to bring the html and css files into WordPress. I’ve tried adding HTML elements to pages and adjusting the css through the Additional css window or plugins. It worked but the pages weren’t very fast and it doesn’t seem like the best method especially for larger projects. Creating custom themes is a bit over my head at the moment since im not too familiar with php, but if that’s my best option then I’ll spend more time learning

I’d appreciate any advice

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