harf/waw isti'naf; aydan...

[yajoudeh]

assalamu alaikum,

1. I remember reading this before, but can't remember what exactly harf al-istinaaf means. waw is sometimes used for this.

2. aydan (also)-I see it described as aydan littawqeed, but how to we classify it exactly. For example, jiddan (very) is maf'ool muTlaq lilmubalagha.

Thanks