>>2795529I think A1111 WebUI is the best if you're just starting out. If you want to get into advanced workflows, ComfyUI becomes useful.
Also to add to what
>>2795528 said, the specific mode of ControlNet that is used for detecting the pose of an image is OpenPose like he said, but other modes like Depth are also useful for getting poses or the general outline of the image. More than one ControlNet model can be used at a time to increase the quality of the output.
Nerdy Rodent has several videos about SD extensions that are pretty informative.
