Keyboard shortcuts:

to move cell up ctrl+m K
to move cell down ctrl+m J
to create a new cell below ctrl+m b
to create a new cell above ctrl+m a
to delete a cell ctrl+m d
to convert a text cell to code cell ctrl + m + y
to convert a code cellt o text cell ctrl + m + m (double tap m)
to replace within cell ctrl + shift + h
to replace within entire notebook ctrl + h
to run current cell ctrl + enter