To create a new post in Doxy Jekyll Theme blog area, you should create a new markdown (.md) file inside the _posts directory or folder.  Here following a post example with different configurations for a blog post page.

layout: post
title: "Post Title Goes Here"
date: 2018-12-01 18:14:30 +0600
tags: [technology, education]
comment: true
excerpt: Here is the example of excerpt

You can easily change your sidebar position from the post layout option.

There are 2 post layout available in that theme. Use post_left for left sidebar and use only post for right sidebar layout