Hi, I'm new to bitcointalk.
I'm only 15 years old and I'm Brazilian, I want to know which is the best long-term investment.
for the next bitcoin halving

I'd appreciate you at that young age you already have an interest in the crypto investment and apparently a good time to start either.
The next halving will commence this coming 2024, it wasn't long to wait, right?
https://www.coinwarz.com/mining/bitcoin/halvingTo buy good projects seems to be the best deal in the current situation. Bitcoin of course is one at the top of my list, however, considering potential altcoins is also a great idea.