This is the 156th most frequent Hindi word.
महज
Merely; Just; Only.
Here, 'महज' (merely) is used to distinguish luck from the main reason, which is hard work.
यह जीत हमारी मेहनत का ही नतीजा है, यह महज किस्मत नहीं थी।
This victory is a result of our hard work; it was not merely luck.
In this sentence, 'महज' (merely) emphasizes youth and the reason for needing understanding.
वह महज एक बच्चा है, उसे और अधिक समझने की जरूरत है।
He is merely a child; he needs more understanding.
Here, 'महज' (just) emphasizes the short amount of time taken to achieve something significant.