This is how you create Articles under the Articles Gategories:
1. Always start with creating “New Article” here:

2. You need to publish the Article you create, so that you can set it under the correct Article Categories group. Here is the picture from this Article And I have set it under the First Problem Article Categories and :
3. This is how you set New Article under the correct Article Categories:
4. From the Article Categories we can create more categories for the articles. This is important that we can get these to visible in the main page:
4. Main page can be found in the Pages module. https://fter.io/knowledge-base/ :