Using the on-page grader and whilst further investigating internal linking, I'm concerned that as the ecommerce website has a very link heavy mega menu the rule of 100 may be impeding on the contextual links we're creating.

Clearly we don't want to no-follow our entire menu. Should we consider no-indexing the third-level- for example short sleeve shirts here... Clothing > Shirts > Short Sleeve Shirts

What about other pages we're don't care to index anyway such as the 'login page' the 'cart' the search button?

Any thoughts appreciated.