On Ang 356, Guru Nanak Dev Ji wrote:

ਵਿਦਿਆ ਵੀਚਾਰੀ ਤਾਂ ਪਰਉਪਕਾਰੀ ॥
vidhiaa veechaaree taa(n) paraupakaaree ||
Contemplate and reflect upon knowledge, and you will become a benefactor to others.

^{_{This is a sincere effort to share my knowledge and educate about very basics concept of Sikhi. I try to collate the information from different resources and present within the periphery of Sikhi.}}