I use inscape, but there are others. It helped me to learn everything I could find about using the Bezier tool. When you click on it, it opens a set of options on top to make it act in various ways.
It helped me to load someone else's pattern or picture and trace it for the practice. Delete it when finished, so that you are not stealing somebodies work.
Watch you tube videos about "inkscape bezier". Have inkscape open at the same time. When they demonstrate some little thing, stop the video and practice that.
Learn to EDIT-DUPLICATE-FLIP. For example, if you make 1 side of a picture frame, use the SELECTOR option, drag an imaginary box around your work, wait for the computer to tie it all together, duplicate it, flip horizontal and move the mirror image over.
I wrote this for inkscape, because that is what I use, but others will work. Travis has excellent videos on this site that are great. Hopefully others will chime in with their thoughts. Good luck Friend.