MuleSoft training has been through a few homes. It started on MuleSoft's own training site, moved under Salesforce after the 2018 acquisition, and now lives mostly inside Trailhead Academy with a parallel set of free trailmixes on Trailhead proper. The practical effect is that you can find three versions of what looks like the same course, and it takes some clicking to work out which one is current. That is the first complaint and the most annoying one, because the underlying material is good. The centrepiece is Anypoint Platform Development: Fundamentals, known internally as DEX401.
The self-paced version is free, runs to roughly 40 hours if you actually do the labs, and has you design, build, test and deploy an API in Anypoint Studio. The exercise has been the same fictional airline flights API for years, which is a bit stale, but it covers RAML design, DataWeave transformations, error handling, and deployment to CloudHub in a way that maps closely to real work. Historically, finishing it has come with a free attempt at the Developer exam, which is a genuinely good deal if it still applies when you enrol. Check before you pay. The certification ladder is priced sensibly.
Integration Foundations is $75 and is aimed at analysts and project people. Developer is $200 with a $100 retake. Platform Integration Architect is $400 with a $200 retake. Half-price retakes at every level is fairer than the single-shot exams we see from a lot of vendors, and it is worth saying so. Where the training falls down is the same place almost every vendor academy falls down.
MuleSoft teaches API-led connectivity, the idea of separating system, process and experience APIs, as though it were simply how integration is done. It is a reasonable pattern for a large estate. For a mid-size company with a dozen integrations it is an expensive amount of ceremony, and nothing in the course helps you tell those situations apart. Nor does it say anything about licensing, whether the older vCore model or the newer usage-based packages, which is the thing that actually surprises people eighteen months into a MuleSoft rollout. Our take: the Fundamentals course is one of the best free developer courses any enterprise vendor offers, and the credential is worth having if MuleSoft is already in the building.
Just treat it as product training, because that is what it is.