Answer 1

When learning multiple languages in parallel you have to make sure that you don't mix up things.
My favourised type of learning is one after the other, but that's personal taste.

Answer 2

Yes no problem. You can learn multiple languages at the same time because these are used together to make a complete project.

Answer 3

Jan Markus It's good to learn one after the other but if you want to make a project then you need to learn all these together.

Answer 4

It depends!! You need to make sure that you apply what you're learning in projects.

If you're a beginner then don't rush it, make sure that your concepts of one language is clear & you apply it in something before moving onto the next bz there are many similarities in languages.

So, if you know one language 'clearly' next time you'll be able to pick languages rapidly.

Answer 5

I would say this depends on how similar these languages are. For example learning HTML, CSS and Python is ok, because these are not too similar. If you learn Python, C# and C++ at the same time, you will possibly mix up the codes. It's similar to human languages: multiple Roman languages (Italian, Spanish, French, ...) at the same time will confuse you. Italian and Danish not

Answer 6

If you're learning all of these it'll make more sense to start with html (then css cause you need to) then Javascript. Those are for front end development.
You can then go on with python and sql for the backend.
This is just an advice though and in my opinion the most logical order

Answer 7

My advice dont learn them at the same time... learn and get necessary experience of out it before moving forward to another language. Then if you are confident enough build a project that consists of these language. ;)