This course from PMI is the best to take for this certification. It provides the required 23 hours as well. It also includes a digital copy of PMBOK which they will absolutely need to study from and practice CAPM exam from PMI which is who the certification is through.
https://www.pmi.org/shop/p-/elearning/pr...urse/16125
https://www.pmi.org/shop/p-/elearning/pr...urse/16125