Is it a good idea to buy some crypto for long time investment plan from exchanges such as binance as keep it there, any alternatives ? Because i have heard bad things about some famous exchanges such coinbase.
In my opinion, the only time you can store your crypto on exchanges is when you're actively trading them. Otherwise, it's just best to use them for the services they render. That is - to exchange your crypto. Since you're considering investing long term, I would suggest you buy whatever crypto you want on binance and then you move them to a wallet
which you own the private keys . When that's done, you can check the value of your assets/investment at periodic intervals. That is the recommended approach.
With all the exchange hacks this year, the best way to stay afloat the crypto ecosystem is to take full custody of your assets.