Are the tax rules for consolidating different cryptocurrencies into one the same as when they are exchanged for stablecoin, or are they different?

I’m just getting started with trading and haven’t gone through the tax process yet. I’m curious about how it works. For example, if I have a few different types of coins and I convert them all into one coin, then cash out, how does the taxation work? Is it more straightforward than I’m thinking? Thanks for your help!