Hi Dimas, this is a very good question and very tricky sometimes. Both "kami" and "kita" mean same, which can be "we" or "us". But "kami" is used in exclusive settings, while "kita" is used in inclusive settings. For example: ->Kami Kami berdua, saya dan istri saya, pergi berlibur ke Bali untuk berbulan madu. (This is exclusive because only between these two person who's a couple who has just married and they are going to Bali for honeymoon) ->Kita Justin Bieber melakukan swafoto bersama seluruh penonton, ketika ia tengah bernyanyi di atas panggung. Kita bertiga, aku, Toni, dan Anton pun ikut berswafoto bersama Justin saat itu. (This is inclusive because it is involved a broader scoop of people, which are Justin with all the spectators)