What Allah (SW) likes most? What dislikes most?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and  Messenger.

Verily, the most beloved thing to Allah is Iman (Faith), and the most disliked is Kufr (disbelief).

Similarly, the most beloved person among the believers is our Prophet Muhammad, and the most disliked one among the disbelievers is Satan.

Allah knows best.