Which field is best thesedays ,in general ?

There is actually no single answer to this question. Many fields have emerged and many fields had failed. Even if I suggest any good field now it won't be the same case after few years. So instead checking what the world sees, you just start of with what you are interested. One advice what is can give is learn coding I.e. C and C++ as it is applicable in all fields and is very much required for you to sustain at any place