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Baggage policies change quite a bit and often, so the best thing to do is check directly on each airline's website or on your ticket before traveling. Generally airlines charge for checked baggage depending on the fare you bought, but some include one bag in the base ticket. Each one has its own rules, so you can't really generalize - I'd recommend going into the Gol, TAP, and Latam app or website and simulating your trip to be sure what's included.
Each one charges differently, so there's really no single answer. What matters is you checking in the app or website of the airline where you already have your ticket booked, because that's where it shows exactly what's included in your flight and what costs extra. Tip: if you're buying the ticket now, see if there's a baggage package option at purchase time - sometimes it's cheaper than paying later.
What nobody mentions is that baggage prices vary depending on where you buy your ticket - sometimes it's cheaper to add baggage on the airline's website than at the airport, like around 10-15 euros difference. But I agree that the best thing really is to open your reservation and see exactly what's included, because both Gol and TAP and Latam have promotions that change all the time and some routes might have baggage included while others don't.
On the ticket you already have booked, the baggage tab shows exactly what's included and how much it costs to add bags - that's the most reliable because it reflects your specific ticket. What nobody else mentioned: if you bought the ticket a long time ago, the policies may have changed since then, so it's definitely worth opening the app or website and checking again before you head to the airport, because at the check-in counter the prices shoot up.
I agree that checking your ticket is the best move, but here's a detail that matters: if you bought a really cheap ticket (like those promotional prices), there's a good chance that checked baggage won't be included with any of the three airlines. Gol tends to charge quite a bit for an extra bag, while TAP and Latam vary depending on which fare you picked. The good news is you can add baggage after buying if you need to, but like people mentioned here, it usually ends up costing more at the airport anyway.
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