The first electronics parts kit that I ordered for my very first RPi (RPi3B) was almost the same kit as shown above.
it was more than enough to get me started (again) with electronics tinkering and python programming.
aside from the RPI-GPIO source, mostly browsed the python command syntax and sample codes.
then searched for some other project tutorials in line with my interest.
keyword used: Raspberry Pi Projects
there are quite a lot out there.... just searching for a good one that matched my interest already consumed time...but it was fun nonetheless
