The difference is the support you are getting.
In the Standard course, you get all the course guides, videos, etc but you won't be able to ask questions, or get feedback. This is suited for you if you have a good understanding of ingredients, formulating in general and you are confident you can troubleshoot formulation issues.
The Standard Plus members, however, can ask me questions under each Lesson. The questions must be related to the relevant Lessons as I cannot help with general formulation issues, I'm afraid. (For example: I cannot help with issues with a lotion if it is solid bar course).
Both packages will have access to the Community section so you can chat with other students.