Jihad in Islam, How to Practice and Understand it?

"What proves that preaching in God constitutes the great pillar of jihad and the source of its prescriptions? The proof can be found in the various works of jurisprudence where the chapters devoted to jihad begin by addressing this form essential so that any enlightened initiate can know that the first application of jihad is to preach God, to ordain the Righteous and to proscribe the Blame As for the various modes of bellicose jihad, they are prescribed to support its essential form as are the branches to the trunk of a tree." extract