Michel,
I have two sources for learning and feedback: a mentor with DMA in composition/Music Director and my son-in-law who is a talented high school music teacher. I have frequent Zoom sessions to discuss my work. So for me, my education is literally a work in progress. It fits my needs (age) at the moment for what I want to accomplish. Also being an orchestra musician I am always in the midst of orchestration, my ears are always tuned to what's going on as we perform. For example, the ensemble playing for the famous Oboe solo in the Brahms Violin Concerto or Sibelius (which I felt could have used a bit of judicial editing!). I did take a year of counterpoint in college. Of course, being well educated in the music literature is crucial, whether its Korngold, Mahler, or Prokofiev. The forum also serves as a good place for feedback and learning. I wouldn't mind some structured/pointed online material that would be easy to digest.
Mark