How do I utilize tagging as a beginner?

I’m new to tag fighters and only have half a year of fighting game knowledge in general, so I’m unsure how to use the tag system in this game. I really only play my second character when the first dies, which is fine but I feel like I’m not using the system to its fullest.

I’m not trying to learn any crazy complicated combos since I’m still new but what’s something I can do to familiarize myself with tagging.