How do I read the Koinly Dashboard?

Hi, I have just imported 3 years worth of tax transactions from multiple exchanges and wallets. I have not withdrawn any funds just trades and transfers. For example, in the first year I have a capital gain of $5k, then the second year have a capital loss of -$3k, and the third year -$3k. And my dashboard says I overall negative. Do I need to pay any tax? I am just a bit confused.