Project management is about doing things right, while portfolio management is about doing the right thing.
If you have multiple projects in your organization, you should definitely learn management of portfolios. It’s not a bigger scale form of project or program management, it’s a totally different concept, focused on maximizing your benefits by choosing/accepting the right projects and programs, and by assigning limited resources to them, in a proper way.
The best methodology for portfolio management is MoP from AXELOS; the same organization that provides PRINCE2®, the famous project management methodology.
We currently have an introductory course to MoP:
Our Foundation level course will be ready in the future. If you’re interested, please subscribe to our newsletter to stay informed of the release.