Savings/ Investing Help

I keep my all my savings in fidelity. I own some shares of apple and Amazon, is this smart for short/ long term? Also should I keep my emergency fund in there as well? I’m not sure what the difference is keeping my money there or in a savings account.
Or I can do both? Keep my emergency fund in the savings account that gains 0 interest and keep my investments in fidelity? I’m just not sure what the best stock is to keep my money in. Just need advice on where to keep my money I guess, it’s not a lot but I need to start major saving and I want my money to make money.