Hyperlinks on the webpage are internal links.
(generally for the same domain links, we call internal links)
<a href=”https://www.example.com”>Anchor Text</a>
Try to add all important sections’ links on the home page. So crawlers can reach your all pages. Add every section link at home page for better crawling and user experience.
Distribute links according to your website structure, add only relevant internal links. Google and users both like relevant links and it also helps to reduce page bounce rate.
for example- suppose you have 1000 pages then distribute your all links in a manner where google and users can easily reach all these 1000 links from the home page.
Add link inside the content where users need to know more information.
Add links on the Top of the content if you are serving content in a series.
Put your links at the End of the content is also good area to add relevant internal links.
Right or left sidebar is also a good place to put your relevant and popular links.
Using many links on a page is a bad user experience and also bad SEO practice.
We should not use more than 100 links (internal+external) on a single page. Because PageRank (link juice) distribution may effect here and google will pass low value further.
I don’t think there is any penalty or huge ranking drop issue using too many links on a single page.
If you have millions of pages and want to add html sitemap, then you can add 3000 maximum number of links on a single page.
I will not recommend more than 3000 links on a single page in any condition.
Internal links in menu, footer and sidebars are less beneficial than using inside the content, make sure that link is natural and helpful for users.
My personal experience says – No!
Internal links only help to crawl pages, not a ranking factor or maybe very minor ranking factor otherwise everyone will connect every page from every page and will rank higher.
Although anchor text on internal link helps in ranking if you use it in right way.
Don’t repeat same link on same page. This is a bad SEO practice. There is no ranking benefit of using same links multiple times on the same page. Although you can use sign up, CTA button link multiple times for conversion purpose.
There is no impact of using absolute urls and relative urls in internal links, both are same for Google.
John Mueller said that in their hangout session recently.
Sometime people use this syntax for href link.
<a href=”https://www.example.com” title=”similar of Anchor text”>Anchor Text</a>
Use internal links for better user experience not much think about how google will consider your internal links. Current Google’s algorithms are able to know which links are good for users and which are not. You can use google analytics, crazuegg, hotzar etc tools for internal links optimization.