Vayikra is the first Torah portion in the book of Leviticus. Exodus ended with a crisis, the Sanctuary to Adonai was finished, God’s glory filled it, and Moses and everyone else could not enter the Sanctuary, because God’s presence did not leave room for human presence.
Leviticus starts with the solution, Adonai called Moses from the Sanctuary and invited him in!
Why does Adonai invite Moses?
Rashi answers, Adonai likes Moses. When you have a relationship of liking or loving God or people, we can overcome any obstacle together.