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I'd also like to point out that your "shitcoin" stance is really binary. Altcoins with good fundamentals and large returns exist. Diversification can reduce risk even in crypto. Each investor should do their homework before investing.
It's best to know bitcoin first, but sure people can do whatever they want. I recommend focusing on bitcoin, and then after you figure out bitcoin, then maybe venture into crap.. if that's what you want to do... but hey, so many people venture into crap, and they really don't even know what bitcoin is.
Bitcoin is already risky.. and if it happens to be your only investment or if you have a pretty low budget, then you likely would not be in a position to really diversify or to dilute the amount that you are investing.. so in the case of OP and anyone who might ONLY have $10 per month or even less than $100 per week, then they likely do not have enough value to diversify until they reach a certain level of investment (which is, of course, discretionarily determined by each person regarding how much of any investment they might need (or prefer) before they start to diversify.. whether that is $5k, $10k, $50k or some other amount.. .. so newbie investors do not necessarily need to spend time learning about other possible assets or investments besides bitcoin.. and again.. they can do what they like, even if it is dumb and even if it results in gambling rather than investing and also potentially wasting a lot of time, energy and money fucking around with shitcoins.
On the other hand, if someone has some actual knowledge about some investment that they can make, besides bitcoin, then surely that is on them in terms of the extent to which they believe that it is worth their time, money and energies to put value in that whether it is long term or some kind of pump and dump situation.. which brings them back to problems with trying to trade.. rather than actual investing.. and I cannot think of any shitcoin that would be worth investing into.. but if you actually learn about bitcoin and somewhere along the way you figure out some shitcoin that might be worth investing into.. rather than pumping and dumping or trading into it, then that would also be a discretionary determine that anyone could make .. and perhaps they might have some small chance of actually being correct, rather than mostly (if not exclusively) focusing on figuring out (and employing and continuing to learn and improve) their bitcoin strategy, first.
Bitcoin is unique and simple. Its called "digital gold for a reason. The envy-inducing stories of instant billionaires made by obscure altcoins are tempting, but grasping the foundations causes cognitive dissonance. Bitcoin's alone. It initiated this revolutionary digital currency tsunami and remains above, not merely by market capitalization but by its innovative decentralization.
Skeptically, competing coins can seem appealing with fresh features, increased scalability, and flashy marketing tactics. No technology or catchy name makes a coin better or safer than Bitcoin. It's vital to distinguish investment from gambling. High volatility and quick returns indicate the latter.
Enjoy Bitcoin. It's endured. Before diving into altcoins, study Bitcoin's fundamentals.