Very good question !! There are many short term courses available which one can learn and start working from home. But it totally depends upon the area of interest which one you want to choose.

If you are someone who loves to speak and socialize you can take public speaking courses and make a career in it, there is a high demand for online trainers and public speakers these days. You can learn trading and investment and become a trader or investor there are multiple sites that you can find easily and start learning. If you like cooking you can start your own youtube channel or work for restaurants/hotels dealing with Virtual or Cloud kitchen.

You can also start online tuition or register yourself to teach primary classes which just requires good temperament and children engaging skill. You can start selling on the various platforms available by making social networks.

You can read this article to know more ideas: Business Ideas during lockdown - Positive Shades