I made plenty of videos on my YouTube channel just focussed on Portfolio for Jira, those videos are structured properly as a course that you can take to learn Advanced Roadmaps. However YouTube is not always great and it is easy to get lost. So you can follow that course here on my site. Here is the link to the course. Apart from the videos you might also find quizzes to validate your learning and some important articles to help you. Enjoy.
Advanced Roadmaps (Portfolio for Jira) free course and tutorial
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Life begins outside your comfort zone and that is where your courage is developed". Write to me by filling this form. For living I am an Atlassian Consultant who love both Jira and Drupal. I am the author of "Mastering JIRA" and "Mastering JIRA 7" books. I Love both JIRA and Drupal (a bit more). You can Write To Me and I will get back to you as soon as I can. Have a nice day!