Hi,
I am a bit lost and dunno where I should start. I am a web developer (mostly working with PHP and JavaScript) and just started using Power Pages for a project but I am finding everything very restricted. After a few researches, I was able to use VS Code to personalize some basic things on the page. However, I cant find much info about how to customize the pre-existing elements of PP, or if we can even do this, without using the UIs.
I was wondering if anyone took any course, know any good "advanced" one or can give me a direction about what I should do to modify elements that are existing? (most of the courses I found were about the Power Platform or just basic things on how to build pages and customize only using the UI of the pp website.
In VS Code, I have a workspace with my page but I can only add JavaScript, CSS, ... but how do I modify an element that I don't even know the name or how to instantiate it?
For example: I have a List that has a Calendar View but I can only see information in there, and I would like the user to click on that and this would take them to another part of the website, so far they can only click and "expand" to see. (below)

Thank you
Regards,
Junior