I heard I have to keep internal links with relevant anchor texts on a website to just a few because too many internal links might "confuse" the bots. So generally I have to build DOfollow internal links just to DOindex pages. This way (at least in my case) I can keep internal links as few as possible.
But what about from visitors aspect, I cannot tell them something like "Go there and find something there" or "check navigation menu, click on some X subject and you will see it there" because this might result in an exit of websites so I would have to build internal links with good and clearly understandable anchor texts for visitors also. Is is OK if I put on that kind of internal links NOfollow attribute so I still meet this requirements about having "as few as possible" dofollow internal links (pointing to DOindex pages)?