The process of adding internal links to an article involves identifying specific keywords that you want to link to and then finding the most relevant article that can be linked to using those keywords. You will need to scan through all of your articles to find the most relevant ones to link to. The manual process of adding internal links to an article can be extremely time-consuming and takes a lot of effort. You can simplify this by using a good WordPress plugin like Link Whisper, which simplifies the entire process and makes it easy to build internal links, all while giving you maximum control of how you want to do it.