BTC is best for more investments. Next comes Ethereum. But better to invest in BTC. It is very reliable and profitable. Investing in BTC will hopefully give you good results during the bull run. You can invest in alt coin, meme coin for short term investment. But that is very cautious. Because nothing specific can be said about meme coin, and other alt coins. Most alt coins and meme coins are scams.
If someone asks me for investment advice, I always suggest him to invest in bitcoin. But for short term investment, altcoin will be best. Meme coin is mostly scam so try to stay away from meme coin investment. From altcoin If you can find some good coins, it will be profitable. And if you find any wrong coins, you will be a victim of scam and lose all donations.
When someone asks you for financial advice, always share some of the knowledge you have, maybe suggest a few options such as Bitcoin and Ethereum, but make sure that you tell them to do their research before they invest because most people wouldn't think twice before blaming you if they incur any losses after investing their money in any of the cryptocurrencies you have recommended.
So it's important to know that whenever you are discussing cryptocurrencies with someone who is new to such things, make sure that you tell them to do their research before they get involved to avoid taking any blame for their actions and carelessness in the future.
P.S: It's called investments, not donations. So someone will lose all their investments if they get into wrong coins/projects.