Smart notebook using Everlast - write, scan and upload to MS OneNote then wipe and erase; research papers markup via Zotero annotators. My quick note taking is usually through Bear app on Mac/iOS which supports Markdown and on-the-fly hashtag creation while typing. Most important is to do proper tagging and organizing notes in some structure for future use or else you pile your notes for no apparent use.
For work I try to put info in Slack or JIRA. If not appropriate it's text files and notepad++
iPad Pro, a pencil and an infinite canvas app. I mostly concentrate on heirarchy and relationships when taking notes, so it’s kind of mind-map-y, though doing it digitally allows me to iterate it’s layout
What app do you use? Looking for a good app for my pro + pencil atm.