Register now or log in to join your professional community.
Intra means within.
Inter means between.
Inter-school football matches mean football matches between schools. Intra-school matches are within a particular school, perhaps between different houses of the school. ("The intra-school matches were an inter-house competition.")
Intrapersonal skills are skills for managing yourself.
Interpersonal skills are skills for relating to other people.
Both intra and inter are from the Latin.