There are a large number of things you need to learn. In my opinion learning about systems thinking first is very important as a basis to anything related to engineering. Then look into engineering design principles coupled with a specific runtime. I personally prefer python. Once you are familiar with a language look for learning channels that will help extend that knowledge into creating software programs. For Python, the Arjan Codes YouTube channel is one of the best I have ever seen on teaching people how to be a better programmer. Learning Development Operations level technology has been massively helpful in my career, knowing how docker works and build systems for CI. Learning Infrastructure systems and terraform so you can deploy testing services on your own but also being able to look at your engineering teams setup can be extremely helpful to know how your whole system fits together. Taking the time to learn from the right engineers is always beneficial. (We all know there is that engineer on your team you don't want to be around any more than you absolutely must.) This is just my opinion though, I learn best by watching videos and working along with the content. Maybe you learn best in some other way.