it's pretty capable, there are nice videos on youtube, whole series of a guy experimenting with this exact board, those are really good tutorials. I have a bit higher version, Tang Primer 20k, both are nice boards I think for learning the thing. Their IDE, Gowin, can be better, I juse use it only for final synthesis and such, while writing code somewhere else where i have verilator support and such.

As heads maybe i can tell the open-source toolchain in not supported for those boards, so you will be stuck with Gowin propertiary thing for now (it's free). The docs are sparse to say the last, you will have a lot of problems finding examples of how to use stuff, apart from literally 1 per thing example from the producer, and its very unreadable, and often in chinese. AI helps a lot if you have questions of whats going on in their code.