Below are Project Management blogs that I read and use as references.
The Digital Project Manager
This website is a wealth of knowledge on project management. The link here will take you to the articles. Check out the rest of the website as well.
Susanne Madsen
A thought leader in project leadership. Her articles are insightful and thought provoking.
ProjectManagement.com
This link takes you to the blog section of the website. Overall, projectmanagement.com is a great website. The blogs are interesting and cover a wide range of topics.