Eihwaz is a shamanic rune. It is life & death & symbolic of the shamans traditional journeying to the upper & lower worlds. This is a reminder that everything is connected.
In the northern traditions, Yggdrasil, the world tree is thought to be Ash but there are strong arguments for it being Yew. Eihwaz is Yew & it's symbol reminds us of a bow, bows were traditionally made of Yew. Yew is evergreen so symbolic of life after death or life in death. The tree green & living in the depths of winter.
In the Christian traditions of Europe, churches & cemeteries were built in the same places as Yews to incorporate them into the eternal life philosophy yews develop hollow centres as they age & this is part of their eternal cycle. They are seen as doorways to the underworld but also as wombs for rebirth
Not sure where or how this rune will help me but it is definitely a big adventure!