I think online learning is a really interesting thing to do as its improving your skills from the comfort of your own home and something which you can do in your own time. Meaning its easy to fit into a busy lifestyle. Its definitely something which I have been thinking of doing myself as its always fun to learn something new.
Udemy recently got in contact with me about a great study they have done on what makes a successful logo. The study is really easy to follow with clear sections divided into heading such as colour, shape/dimensions and consumer preferences. It's a good read for anyone who needs some tips on creating a logo or even a refresher for anyone already in the business.
Look on their website to see more, theres also a tab the top of the browser which allows you to search the courses so you can find exactly what you are looking for. If your an arty person like myself I would suggest looking in the design and photography sections as there are some really interesting courses to do.