It's also important to know what he means when he says long-term. If he means really long-term, I agree that the top coins like Bitcoin and Ethereum are the best choices. They might not explode, but they can grow steadily and probably will do exactly that. You could say that those coins are the least gamble of them all.
You must prepare for future explosions. top assets like bitcoin and ethereum in the long term will be poised to make a bang.
now we are growing but there will be a correction again. the momentum won't come for now. we have to prepare it for the long term.
what we need to do is to determine when we have to enter at the right momentum.