You are likely already aware of MOOCs (Massive Online Open Courses) such as Coursera and edX. Such platforms offer a wide selection of programs which you can browse and see if something fits. Unlike these online platforms the below academies focus on particular areas:
Autonomous Mobile Robots (AMR)
- MiR Academy
Robotic Operating System
Hydraulics and Mechatronics
- Bosch Rexworth Academy
Bearings
- NSK Academy