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If you're considering an engineering career, take a look at this collection of free online engineering classes. Several schools offer no-cost learning material to anyone interested in the topic.

Diploma Guide explains:

"Free courses can be utilized to build a foundation of knowledge in different areas of engineering. This knowledge can be very helpful if you are getting ready to take a formal engineering course or if you are currently employed and looking to expand your understanding of specific topics."

Although these no-credit courses can't earn you a degree, they're a good way to explore the subject and give online learning a try.