Some people said that Allah has told Allah takes the form of beggar or hunger..i really dont know about it...i want to know about it...

Allah has no form or shape or image and takes no form nor shape nor image.
If one thought so or doubted about that, then it's Riddah kufur, one must correct their belief and say the Shahadatain to return to Islam.

Remember Three Golden Rules:

1.       Allah does not resemble the creation in any way whatsoever.

2.       Allah exists without a place.

3.       Whatever you imagine in your mind, Allah is different from that.

Ibn Hajar said: "The creed of the Salaf and Khalaf is that Allah is clear from movement, change, or dwelling in a place. Absolutely nothing resembles Allah". Abu Mansur al-Baghdadiy reported the consensus Ijma^ that Allah exists without a place. Whatever you imagine in your minds, Allah is different from it.

See:

The Explanation of the 13 Attributes of Allah

These thirteen (13) attributes are: Existence (al-Wujud), Oneness (al-Wahdaniyyah), Eternity (al-Qidam), Everlastingness (al-Baqa'), Non-neediness of others (al-Qiyamu bin-Nafs), Non-resemblance to the creatures (al-mukhalafatu lil-hawadith), Power (al-Qudrah), Will (al-Iradah), Knowledge (al-^Ilm), Life (al-Hayah), Hearing (as-Sam^), Sight (al-Basar), and Speech (al-Kalam).

http://alsunna.org/The-Explanation-of-the-13-Attributes-of-Allah.html