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Freshen up on your Common Lisp skills with @vindarel 's Udemy course and support his work along the way:
https://www.udemy.com/course/common-lisp-programming/?couponCode=CELEBRATE1001
His course celebrates 1001 learners today and he's probably the most active missionary to bring Common Lisp to newcomers in an accessible way.
Disclaimer: I do *not* receive any commissions for this link.