Should I learn two languages at once?
I am wondering if it would be too difficult. Or, if I were to do it, what languages to do it with. Thanks!
Actually, I'd disagree with a lot of the other replies. While you can get two similar languages mixed up, they can also support each other by re-inforcing or contrasting grammar structures and words.. And you actually get ANY two languages you're learning at the same time mixed up. What I'd be concerned about is whether you have learned any language besides Dutch. If not, I'd wait until the second checkpoint before starting another language, and then pick whichever one seems the most interesting. There's a certain amount of learning how to learn a language involved.
It doesn't matter, whichever interests you most. I might stick with Indo-European, (Italian, German, French, Swedish, Norwegian, etc.) Irish and Welsh are Indo-European, but a little harder than the Germanic, Scandinavian or Latin languages. Just because those are easier when you're starting out. Learning a language with a whole different grammar, word order, etc. is kind of intimidating if you aren't comfortable learning languages, so I'd avoid Turkish, Hungarian, vietnamese, etc. until a bit later, but if you want to try, go for it.
from my perspective it was a bad idea to learn 2 at once when you are beginner in both of them. But if you get an A2 (approximately) in a language, you will not have problems to keep learning others. There are a lot of polyglot youtubers who speak about this topic. One of my favorites is "Luca Lampariolli". Although he used to learn one at a time and 2 years for each of them, but maybe 2 years is too much and sometimes the curiosity about other language is stronger.
Spanish and Esperanto are easy to learn: they are pronounce like it's written.
German is, too. But it's a Germanic language, seems to be similar with Dutch.
Catalan is nearly the same with Spanish, and yeah, pretty easy
Hebrew and High Valyrian: Really hard to me, especially Hebrew
Vietnamese is hard, too. But you might want to try it. I love this language.
I personally, contrary to many others, don't mix up languages. I used to mix up German and French really late at night when I was doing school homework, but now I'm used to so many languages it's not an issue at all, it's only an issue when I go to a language I haven't studied in a while, which isn't often because most of the languages I'm doing compliment each other in some way.
I say go for it if you feel you want to! I wouldn't do so many simply because you won't have time for all of them, but I disagree with the notion that you're gonna mix them up.