Stable coins are coins that are pegged to the currency value of a country. The facilitate easy liquidity when you want to cash out any crypto assets. e.g of such stablecoins include USDT, USDC pegged to the dollar value. They're not expected to grow or increase in value beyond the value of US dollar and it's ideal to store your backup funds if you don't want to use traditional Fiat and for the record, they're not investment coins since you don't expect any ROI from them. They're not shitcoins, but stablecoins and serves a different purpose.

Shitcoins are various pump and dump crypto projects which people mistakenly see as investment opportunities, which most of them want to get quick profits from and end up possibly losing their funds when liquidity is removed, trapping late investors. Shitcoins should not be seen as an investment medium, Bitcoin core values and foundation is stronger than all competitors and it's a valid investment concern which should be taken seriously to secure your financial future.

You cannot hope to secure your financial future by going into shitcoins, because they can disappear at any time, but long-term investment into Bitcoin has proven historically to be the best option and continues to validate that and it remains the best choice for investors with a long-term vision. It's more profitable to accumulate Bitcoin and hold for a long-term.