ao3
It is basically a big granary in HP circle. However, FFN has been involved in the controversy of rudely deleting the author's XXX works before, and the functions of the website are relatively primitive. In recent years, it has been obviously caught up by AO3. Judging from the number of new works, many authors have also moved their works to AO3 one after another. Perhaps it is because AO3 has a relatively high proportion of adult works, so readers are relatively more mature, and the works that are praised are more in line with the orientation of adults.