First day of Splinterlands

hope you all are well today i played the first battle of splinterland and i understood very little of this game

And in today's day, whoever played the battle, I lost all the battles.
It's taking me a long time to understand this game

May be if i play this game everyday then maybe it makes sense to me
if you guys can tell me something about how to play it i will be very happy in this
i dont know characters or cards and i don't even know What is this battle based on and how to use each of the cards