You can use custom menus if your theme supports like I have done on my website click on my name
The categories are a way of classifying your posts. So technically the categories ARE your posts.
Example: If you were blogging about music, you might choose to categorize your posts into “classical”, “jazz”, “chamber ensembles”, etc….
However, if you want to have a page of ALL of your posts, you probably should create a category that you will check on each and every post. Let’s call that category “All”.
Then, if you wanted to have a page of all your posts from every category, simply go to “Menus”, then go to the “Categories” box, select “View All”, and then select “All” – then “Add to Menu”.
This should create a page for you that contains all of your posts, and will list it on your menu bar.