Can ı take Bitcoin from one country to another?
Bitcoin is not physical. There is no need to take it around if you are travelling. As long as you have access to your keys, you can access your bitcoin from anywhere (with an internet connection).
One way to think about "carrying/transporting" Bitcoins is to understand that they aren't actually with you at all. You can imagine the Bitcoin Blockchain as a giant vault with infinite boxes.
The "Bitcoin" that you are carrying is actually the key to your box in the vault.
So, rephrasing the question:
Can you take information from one country to another?
Legally speaking: if you aren't going to a dictatorship, yes.
Practically speaking: No one is able to know what you are carrying inside your mind.
Should you take wallet (a piece of hardware or software that stores that information to you) to another country?
You might want to do it discreetly to avoid problems or abuse with custom officers or even being robbed while travelling.