Choose a freeCodeCamp path that matches a specific skill goal. Complete enough exercises to reach a project, then build and explain the project without following a step-by-step solution. Check whether the curriculum's pace, feedback, and accessibility fit the learner.
A certificate is a milestone, not proof that the skill transfers. Keep a portfolio of original work and identify gaps that need documentation, mentoring, or practice elsewhere. Compare learning platforms by what a learner can create independently afterward.