The best cryptos to invest in are those which have the best usecase and a strong community backing, because that remains the major factor that drives prices of cryptocurrencies; crypto projects are majorly built to solve certain problems that local currencies cannot and even to cover up for the lags that are innate in physical money, hence any crypto project that suits this characteristic of solving the problems that can be faced with physical currency and has a strong community backing with better usecase will drive the attention of institutional investors and hence bring a good return.
Also a coin in which an upward volatility within this stipulated time frame will also bring best returns; to be on the safer side, the first top cryptocurrencies by market capitalisation will be safer to invest, but most importantly, Bitcoin is the leading crytpo which is renowned for being the first cryptocurrency and also the one with the most support across blockchain.
Because crypto is very volatile and even the number one crypto can decline in price, it's best to know the best trading strategies to use in trading these coins. One needs to be cautious of trading and investing into cryptocurrency because it is very volatile and always remember to invest the amount you can afford to lose, never invest in unrealistic platforms that promise unrealistic returns in short time frame and always watchout for scammers out there.