Assalamu Alaykum
What are the conditions for a Khateeb? Does he necessarily needs to be an Aalim i.e. someone who has studied formally at an Islamic institution or is it enough for him to be sahihul aqeedah who has good knowledge of Arabic language to refer to the book of salaf to read the khutbah for people on Jumuah or Eidayn.

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.

It is not a condition for the Khateeb (speaker) of the Jumu'ah to be a graduate of one of the official educational institutions nor to be well-versed in knowledge. However, he must have enough knowledge of what he says. The Khateeb is a caller to Allah The Almighty and one of the most important qualities of a caller to Allah is to have knowledge of what he calls people to. The greater his knowledge the more he can benefit others. When qualities like being skillful in speech delivery, being charismatic and pious are added to knowledge, the Khateeb would become more beneficial to the community, with the permission of Allah Almighty.

Allah Knows best.