First, you need to master the experimental protocol. My top pick here is this tutorial by @Ati_lz & @Moutinho_C. I highly suggest reading the glossary to get familiar with the jargon.
Tonsils are model secondary lymphoid organs (SLO), as they are the first line of defense against many pathogens and are easily accessible. Thus, a complete map of these cells is key to understand how adaptive immunity develops, and to map the cell-of-origin of many lymphomas