Learning to code is a never-ending process, there is no arrival point and if one can't enjoy it now at this stage, maybe it is better to look for something else instead of living in a constant status of frustration.

I took for granted the existence of APIs that allow you to make optimized live search of flights and book them. It was a highly wrong assumption. And here we are with the first lesson learned: Never take anything for granted, especially as a Junior Developer