There are lots of different programs I use in the course of my day. These are the programs I recommend because I use them myself. Below are affiliate links, which means I might get something for you following them, but it’s at no additional cost to you.
PicMonkey– I’ve been using PicMonkey since 2016. It’s what I use to make all my graphics.
The HungryJPEG– When I’m looking to add something to my graphics that I know I specifically want, I often go to The HungryJPEG to find it. Most especially my watercolor elements.