Narrated Abu Huraira:

The Prophet was asked, "Which is the best deed?" He said, "To believe in Allah and His Apostle." He was then asked, "Which is the next (in goodness)?" He said, "To participate in Jihad in Allah's Cause." He was then asked, "Which is the next?" He said, "To perform Hajj-Mabrur. "

1. believe in Allah and His Apostle (easy enough?? think again)

2. Jihad in Allah's Cause (looks hard?? well, jihad has lot of way)

3. Perform Hajj-Mabrur