One of the small projects I've had in mind for a while was to set up the Discogs API on my site to pull in all the records from my collection. This isn't something that would be considered especially challenging by most seasoned developers' standards, but it's something that I've had to do a surprisingly little amount of in my career. The specific challenge in this case was figuring out how to pass my API token in the request on a static website with no real back-end.
.env variables and passing the variable to the API. The problem with this is that the variable is still rendered in plain text on the front-end, so it's ultimately not much different than passing in the key directly. I was going to start learning about setting up an Express server or something of the like, when I somehow came across this Learn with Jason video with Joyce Lin which explains exactly how to do what I was trying to do on exactly the same hosting platform that I was already using.
Jason explains the process of setting up a Netlify Function to make the API call. You then leverage Netlify's environment variables to store the API key. I don't quite know what's going on under the hood with those variables, but I do know that when used with the functions tool, that data is never exposed on the client-side, thus being a perfect solution for this sort of thing.
This still took me a good chunk of a Sunday afternoon to figure out, but I'm glad I came across Jason's video because it was a really helpful way to learn about something I didn't fully understand.
I still have a lot of updates to make to the Records page to make it more functional and cool, but I at least got something off the ground that has been stationed purely in the "that would be cool to do" part of my brain forever.