1. Bitcoin (BTC) Bitcoin has been around for the longest of any cryptocurrency.
2. Ethereum (ETH) Ethereum is different from Bitcoin because it isn't only a cryptocurrency.
3. Binance Coin
4. Cardano
5. Polkadot (DOT)
6. Ripple (XRP)
7. Litecoin
8. Tron (TRX)
9. Polygon (MATIC)
10. WazirX (WRX)
For investment, I dare directly answer Bitcoin and Ethereum. However, if it is a long-term investment, I do not dare to give a definite answer. I think, Bitcoin (BTC) is one of the few cryptocurrencies that is safe for long term investment. Again, I can't guarantee 100%.