I use Apple Notes for all my note taking. There are many note taking applications out there for Mac/iOS and while Apple Notes may not be the best, the price is right (free), it syncs with all of my Apple devices - MacBook, iPad, and iPhone (sometimes the sync fails in frustrating ways), and it nicely integrates with the Apple Pencil on my iPad. I do a lot of note taking with the pencil and handwriting, because I find that’s a very fast way for me to get things down.