Thank you for the video Francisco. It's simple and clear.
But my question focuses on anchor links from Page A to Pages B, C, D.
Page A
"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
In this example I have marked with bold the linking text <a>to pages B, C, D. This is not about keyword density, this is about anchor link percent.</a>
<a>The main issue is... how many anchor links are accepted as good? one is enough?
1 Link to page B is the same that 2 Links to page B?</a>
!!