Did all the Muslim tribe fought to take the leadership (not fighting (talk))

for what did prophet Muhammed saw struggled and who came to solve the problem when Ansar were arguing ( when satan tried to break the unity of Muslims )

who did prophet Muhammed saw said to be the leader after his death and who should be the helper and advisor

who was with prophet Muhammed saw from the starting of Islam until the prophet s death he sacrificed everything and also known as the best muhajirin ( he was the first khalifa and prophet Muhammad saw s best friend when he said omer r or Abu ubaydah r will be the Khalifah but omer r refused and made him Khalifah who was the person

where was prophet Muhammed saw was buried and who was prophet Muhammad saw s body

many neighbors thought Islam became powerless after the death of Prophet Muhammed saw

who was the commander of the war with the Romans after prophet Muhammad saw s death

how many rules of war did Abu Bakr teach Usamah r

this war ( led by general Usamah r ) was the ________ war of Rashidun Caliphate. this was the same army that fought in mutah battle. Usamah r father was one of the commander in that war he was the adopted son of the prophet Muhammad saw who was he