Depending on your interests there are some great online courses (all free!) on edX:
1.
MITx 16.00x Introduction to Aerospace Engineering is a great introductory course by MIT professor and NASA veteran astronaut Jeff Hoffman. The course has ended but you can still enroll and access all of the course content. Hard math parts optional; many students / enthusiasts simply skip them, and you can freely jump around to topics which interest you (e.g., Orbital Mechanics).
2.
UC3M The Conquest of Space is another free intro course blending the history of spaceflight (from the V2, sputnik, Apollo to present day) along with more technical topics. The next class starts Feb 28.
3.
EPFL Space Mission Design and Operations is a more rigorous course taught by veteran ESA astronaut Claude Nicollier. Orbital mechanics are explored at length. If you still remember your undergrad level physics & calculus, this may be the course to take. The next running of the course starts Feb 22.