How to buy BNB at the right time? altcoin or main coin?
The right time to buy coins is when the price is dropping. Nobody buys coins with proven potential like BNB and ETH when their prices are on the rise. See what is the highest price of BNB coin in 24 hours and what is the lowest price. When the price position matches, then buy. That's what I often do.
I think it's not about day trading, but a longer period of investment, which is much more difficult.
BNB definitely has a lot of potential, but I would not invest until the announcement of ETH 2.0. At the moment, the price of BNB is quite high, so if ETH 2.0 is coming soon, it could happen that investors will move their money from BNB and the price will go down. In my opinion, a good time to buy BNB will be some time after the implementation of ETH 2.0.
You cant really tell for such switch up even though ETH 2.0 would roll out because we've seen that theres so much support on BNB which do really flies on together with the popularity of the exchange and as long that they would really be having that reputation and of course that real use case of BNB which is actually good then i wouldnt see for this to be worth and would good to be hold for long term.
If you do decide to short or active trade with it then its your choice.