short HP fic -
Stuff that shits me in fanfiction, especially harry potter fanfiction
overuse of 'explain!'
Characters repeating known facts followed by saying 'if I am correct'
Using nicknames instead of names, especially 'Herms, Hermy, 'mione'
phrases like: 'raven haired teen', 'his very soul' (all souls are very apparently).
terms like: 'golden trio', 'leader of the light'
fanon ideas like: spells being affected by the magical power of the caster, helpful goblins, dragon hide armour being resistant to spells, books on unusual magics being freely available from bookshops, occlumency as mindscape construction, mega wealthy harry, Dobby being harry's bonded house elf (Dobby wants to be free and he really likes Harry, this is also very unnecessary to the plots of the stories that use it), House elves able to come when called no matter where in the world they are (why would anyone use an owl to send letters if they owned a house elf?), department of mysteries who wear anonymising clothing (they are called unspeakables not unknowables)
Short works that I recommend:
Long Works I recommend