Fungi as part of a growing system rather than as a disease: mycorrhizal partnerships at the root, Trichoderma and the other biological control organisms, composting and substrate life, and general mycology for people who found it through the plant.
Pathogenic fungi have their own boards. What belongs here is the useful half of the kingdom, which in practice means root inoculants, the conditions under which they actually establish, and the compost and living substrate work that keeps them alive once they do.
Two things are worth knowing before buying an inoculant. A mycorrhizal product only works if the spores meet the root, which is why it is applied at transplant or into the planting hole rather than poured over the top of an established pot; and the partnership takes weeks to form, so it is an investment in the second half of a grow rather than a rescue. And high phosphorus feeding suppresses the association, because a plant with abundant phosphate has no reason to trade sugar for a fungal partner.
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Related elsewhere on the forum: Mycorrhizae, Trichoderma, Bacillus: the Root Microbiome Arsenal in General Nutrients Q&A.