Websites are often built with a combination of many coding languages, but the main three that add style and structure to your website are CSS (Cascading Style Sheets), Javascript & HTML (HyperText Markup Language). You don't need to know too many specifics about these to fix your website speed. Basically, when writing in these languages, developers use certain formats that make the code easier for a human to read. This includes spacing, notes, etc. Technology however, does not need any of this to understand the code and, at the end of the day, it adds time for the files to be processed. So, to fix this, you can minify your files! This removes the excess formatting that us humans need in order for browsers to process the information faster during page load. There are many tools to do this and if you have a WordPress website, multiple plugins can take care of this step for you without having to dig through any files.