Does it make sense to invest a bit of money on all altcoins?

[Ertetert]

Not on all. At least on those you have done some minimum of research.

[amacar2]

Yes you can invest in all of them as you are only investing $20 in each of them you might not loss much and you are diversifying your investment so your chance of lossing will be really small even if one of the coin will get correction. When bitcoin is pumping hard like right now, all alts will get bloodbath which is best time to buy some of the alts.

[twodimensionalme]

Your strategy is doable and the coins you have picked so far look good. When you say you will be holding the coins for long term, how many years are you intending to hold the coins?

Ideally 2-3 years, but it depends on how the market changes in the next months. Let's see.

Anyway, I want to thank all of you for you kind replies. I don't know anyone else except my wife ( ) to talk about cryptocurrencies, so it's great to be here.

[illiki23]

Put together a diversified portfolio containing the top however many coins on coinmarketcap and invest part of your funds.  Pretty safe, especially if filtering for volatility. 

But also try to find coins with promising technology and solid development but are undervalued and invest part of your funds in this.  Buy low and sell high.