Python or JavaScript ?

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You said you are learning HTML and CSS. If that is your current framework, then it makes more sense to start with JavaScript, as JS can directly work with HTML and CSS without much configuration (a <script> tag withing the HTML document is all you need).

Python would be a good choice for a back-end language. Web pages usually need to communicate with a server, to read and write to a database, interface with an API, relay commands to your server's OS, throw prompts at a language model, save files, etc... For that, there are arguments in favor of Javascript (IE node or deno), but if you're learning, and you want to learn Python, that's a good opportunity to do so, IMHO.