It depends on what you are designing. Adobe Creative Suite is industry standard. I use Premiere Pro (video), After Effects (video/promos), Photoshop (web images, branding, logos), Illustrator (branding/logos), InDesign (ebooks, menus, etc) and Camtasia Studio for quick video. Stock anything, I use Envato Elements and online elearning courses I use Articulate (RISE & Storyline) and for LMS course design I ​use MasterStudy Wordpress LMS theme and plugin because it accepts SCORM files from courses I ​build in Articulate and it allows me to develop self-hosted online courses.