im new, sorry if i ask stupid questions!

Hi there, im new here and fairly new to AI art/photos/videos. i found a video showing comfyui which i triedit was hard! i done a few installs, had it sort of working then not. tried another youtube video to follow which half of the nodes didnt work properly. the other day i tried again and failed. it was working but took half an hour to do a 5 sec video which was quite pixelated. SOughhh. i went on google and tried to se if there was anything similar and found stable diffusion. i have it installed via StabilityMatrix.