What a great time to be alive! Things have really changed in the last few decades as it relates to education and access to information. There is an abundance of information and courses available online now; and so much of it is free. I have been taking advantage of such offerings for years. I will be offering a list of resources here soon, but here is a good example:

Principles of Biochemistry
https://www.edx.org/course/principles-biochemistry-harvardx-mcb63x-1
This course explores the molecules of life, starting with building blocks and culminating in complex metabolism and associated diseases.

Cell Biology: Mitochondria
https://www.edx.org/course/cell-biology-mitochondria-harvardx-mcb64-1x-0
A human-centered approach to the fundamentals of cell biology with a focus on the power plants of the cell – mitochondria.

Check out all the other offerings at edx.org

I have taken course online from Yale, MIT, Open University (in the UK), just to quickly name a few.