Guidelines
If you decide to take on this “multi-language challenge,” here are some useful tips.
1) Choose a maximum of TWO languages at any given time. Three languages is excessive and will impair whatever language core you’re trying to build.
2) Choose two languages that are distinct from each other. Languages that are similar can overlap by way of words, grammar, emotions, memories, and other factors, thereby causing confusion. Therefore, learning Spanish AND Italian, Dutch AND German, or Portuguese AND Romanian at the same time is not a good idea.
3) Try to choose an “easy” language and a relatively “difficult” one (I explain this concept both in English and Spanish on YouTube)
4) If you choose two languages that are at fairly opposite ends of the complexity scale, give the difficult language 70-80% of your budgeted time, and give the “easy” one 20-30% of your budgeted time.
5) Study both languages every day.