A sidebar is not a complete necessity when creating a blog. If people love your content, more likely than not they will share it on social media. You don’t need a sidebar for this either since you can add social sharing button throughout your posts.
So when will I need a sidebar?
By incorporating a sidebar into your blog, you can easily promote any additional products or services. Connect with your readers by incorporating your bio—this helps build a loyal community.
If you are trying to get repeat visitors, use the sidebar to put links to your social profile or email opt-in box. For pages that have a defined goal, I would advise excluding a sidebar because it will help increase your conversion rate.
Something to keep in mind when adding a sidebar is to keep it on the right-hand side. You want your content to be as easy to read as possible.