The Skaldskaparmal in the Prose Edda says, albeit within a poetic context, that a man is described first of all by his actions and only then by his property or his family. I believe it is an important virtue that should be cherished and respected when found. Yet this is not a value that you can simply decide to exercise and go out and do by force of will, or even intellect, alone. Intelligence and knowledge may be extremely vital components of many wise decisions but real wisdom, in the broadest and most widely understood sense, has to involve clarity of vision, perception and the ability to judge people and situations. There is no course of study that can help you gain such abilities.
Wisdom is a virtue to aspire to and be granted or hard win.
Although to many asatruar this is probably the most important virtue. As far back as Roman times Tacitus noted how essential fighting, and the martial virtues such as courage, were to the Germanic tribes. Commanders were expected to lead by example and show great energy and courage because authority did not simply come from their rank. Cowardice was deeply disgraceful and it was one of their transgressions punished by being buried in a bog to hid the shame. The later Vikings were well known for their brave fighting and stoic attitude to death.