Hi @htjadhav, congratulations on developing five courses!
You can use some lectures from one course in another, as long as the repeated content is included to support student learning in a distinctly different course (i.e. you can provide some duplicate lectures for context, but the skills learned in each course must be unique). The content from one course should be at least 50% unique from another.
Please use your best judgment to deliver a unique, valuable course that will teach students something new.
If you have any additional questions or concerns regarding this, please contact firstname.lastname@example.org, and the team will be happy to clarify your doubts. 🙂