Which is the best and most convenient programming language ????

Answer 1

mostly it depends on what you want to program.
for example, php for server side,
java for android apps, etc.

but IMO, the most versatile programming language would be C/C++. it can do almost everything despite of its steep learning curve.

Answer 2

Convenient is Python.
For me it is best, but looking at applications wise, I go for Java/C++