What I’ve noticed that seems to make fungi particularly challenging is that they don’t seem to visually sort into taxonomic groups as well as other taxa. Like with birds, insects, plants, etc. there are usually fairly obvious morphological features that you can use to sort them into higher levels, even if there are way too many options to learn them all individually down to genus/species.
Maybe I just don’t know the features yet but that seems less true for fungi; it’s a lot more of having to memorize each individual genus/species based on a combination of features including its substrate, which makes it a much steeper learning curve to approach the group as a whole.
The ones I know are lichens (usually class Lecanoromycetes), mushrooms with gills (usually order Agaricales), and shelf fungi (usually order Polyporales). But even those have lots of exceptions as far as I know. If anyone has any other tips for higher-level fungi identification I’d love to hear them.