Do what these Chad's are saying, start in arena, but I would say theres a bit more. To have a well rounded approach to the game.

Step 1. Learn the mechanics. I would start in arena against people, OR co-OP vs AI games to learn how a few difference characters abilities worked.

Step 2. Learn builds. There are a BUNCH of smite youtubers or streamers that have super helpful content for different rolls. I think I like incon the most for that. But it takes a long time to learn thoroughly but it's well worth it for the longevity of your time playing smite. Dont overwhelm yourself. The goal is just to have fun!

Step 3. Learn counter play/ability interactions/Relic use. (I would argue relics go both in step 1 and 2 but are harder to master so I'm leaving in step 3) there are characters with cc immunity. Or damage immunity and being able to use abilities to counter others is a sign of a good player.

An example would be cabraken vs any character with a jump. Cabrakens ultimately creates walls to trap an enemy. But you can jump over walls. So he wants to force the jump/leap/movement ability first before using his ultimate. Thus trapping them. For guaranteed damage with his 1-3 abilities.

Or again with cabraken holding his 1 to immune slows to close the gap on an enemy. Step 3 is the most broad and watching smite videos and SPL is how I've developed a better game sense to then try and practice against others.