Which programming languages are to be preferred while preparing for placements?

Answer 1

That depends.

If you are apply for Microsoft technologies you should know C#,.Net
But if you are going for web development you should know HTML, CSS, JavaScript.
If you are going for mobile app development Java,Swift may help.

But you must learn Python, Python have most application from web development,Robotics, Data analysis, IoT etc.

for easy we can say.
Python, JavaScript, C++, Java help most during interview.

Answer 2

oh k thanks