which language should i learn?

一定係法文或者西班牙文！
法文比較高尚，因為有好多國家用佢做官方語言。而西班牙文就好多人講，係全世界第二多人嘅母語。
另外，上面有位回答者叫你學阿拉伯文，去吸引嗰班有錢嘅酋長叔叔投資。但我就唔建議一開始學外語就學阿拉伯文。因為阿拉伯文同好多文字唔同，係右至左書寫嘅，而且啲文字、語法都要重新由零學過。其實啲酋長叔叔好多都去過外國留學，英文好流利，有好多可能識埋法文或者西班牙文，所以唔好貿貿然就去學阿拉伯文，學識法文同西班牙文是但一樣已經好夠。
我自己就自學緊西班牙文，我覺得如果你唔懶同埋係有心學嘅話呢，一定無問題，保證學得識。

I think you should try learning Spanish. It is spoken in many different countries and it is not that hard to learn! But I am afraid I don't know where you can learn it because I am not in Hong Kong at the moment.

Buena suerte!

Arabic

That is because, recently, A lot of Arabic invest much money to HK and Mainland China

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