Assuming they already have some bitcoin probably use lightning. Many people's first use of the base layer will be either to withdraw to lightning or to send to a wallet that allows them to convert to lightning.

This will give them the understanding of the base and second layer and that onchain is for saving and second layer is for spending (or micro stacking/micro spending). Eventually this might not be the case and newbies might only ever interact with secondary layers but I think current newbies should still interact with the base layer.