intuitive f2l is pretty simple and it just comes down to a few different cases and the already formed pairs, after that, just practice a lot and eventually those cases will become more and more efficient. I don't really memorize the f2ls it just kind of got rooted in me after practicing a lot...
Either that or you don't have good internet. I think that the HTML is still functioning, which is why the links are there, but the network couldn't send all the image assets. Check your internet.