Affinity Designer: Introduction
Affinity Designer is an excellent vector art & design software created by Serif (Europe) Ltd. It won the Apple Design Award in 2015. Initially, it was available only for Mac, but now is available for both Mac and Windows.
This video here gives a brief introduction to some of the features and capabilities of Affinity Designer for beginners.
Affinity Designer v 1.5.5
Also, follow the link below to know why Affinity Designer is an indispensable tool for both UI and UX designers: Affinity Designer: the perfect tool for UI and UX design.