A couple of more general points about using semiconductor devices:
1) Device manufacturers really, really, really want you to use their stuff successfully. They also want you to choose their technologies in your initial planning. So... They (the good ones), that are selling newer technologies, spend a bunch of money on applications engineers that will create lots of materials to teach you how to use their stuff. Go there first for information and education. They are engineers, like you, they will be efficient at telling you what you need to know.
2) However, OTOH, a GaN manufacturer won't always be objective about the benefits of Si or SiC, so be aware that they are subtle salesmen. So you will also want to become familiar with the different technologies in a general sense; their benefits, costs, targeted applications, etc. The same is true for general design requirements. For example, we all know (or will) how to drive the gate of a Si MOSFET, except for subtle details, there isn't a need to worry about the details of the different manufacturer's devices. Same for SiC, GaN, etc.
3) Engineers, like you and I, have a weakness, a bias; we are interested in and want to use the newest coolest technologies. If you want to make your management and customers happy, you need to be objective about this. In my 30+ year career, I rarely actually got to do the designs I thought maximized my fun, interest, and education. When looking at newer technologies, make sure that you are objectively evaluating them against the tried and true approaches. New devices are typically targeted at niche applications, or what I might call extreme tech. These are companies that don't worry too much about NRE, time to market, low cost, etc. You also need to match the entire design to the benefits of these devices. For example, there isn't any point in using the latest uP with the best benchmarks, if you don't give enough RAM to allow it to shine. There isn't any point in using the fastest power transistor if it's too fast for it's commutating diode, or if you don't layout your PCB to take advantage of it's speed. SMPS that switch above 1MHz are interesting, feasible, and sometimes a good solution. But, there is a really good reason that most SMPS use Si MOSFETS at 100-200KHz.
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4) Steal the application engineers circuits as much as possible, especially PCB layout snippets. They put a lot of effort into them, effort that you can skip if you take their advice.
