The phrase "nice primer" refers to a helpful introduction or basic explanation of a subject or topic. It usually describes something that is clear, easy to understand, and provides a good foundation for further learning. Full definition
It is a very nice primer, a lot better than some high end ones I have tried and I recommend this for those who love to have glowing luminous skin like me. (facetocurls.com)
It also makes for a nice primer to a binge of HBO's TV series. (businessinsider.com)
The Confederations Cup is not extremely popular, but it's a nice primer for next year's World Cup. (sportsinsights.com)