Bitcoin is the first and most popular crypto coin in the market. It was developed to act as a digital alternative to money. Bitcoin pioneered the decentralized network called the blockchain, which is a public ledger that records all transactions.
Whereas an altcoin refers to any crypto coin or token apart from bitcoin. Alt means alternative. Some popular altcoin are ether, dogecoin, ripple, litecoin. These coins are created to overcome some shortcomings in bitcoin. Altcoins offers a safer and secure passage of transactions.

First I would like to tell you what stocks and mutual mean in simple language.
Stock : A stock represents a share of ownership in a company. When a company like Reliance, Infosys does well, those who own shares receive the benefit. As the company grows the stock or share prices goes up, giving an opportunity to the buyers to Sell at a price higher than they bought.
Whereas, Mutual fund is a pooled investment that contains shares of many different assets. Many mutual funds include a wide range of stocks and bonds. When you buy shares of mutual fund, you receive a slice of everything included.
If you want something that’s easy to trade, and has low trading costs with large gains you can invest in stocks. But if you want diversification you can invest in mutual funds. As, owning a diversified portfolio of stocks is less volatile it can prove to be a good option.