Looking for something to do during lockdown? Learn to code for Openhab in Java. If your wondering if java is worth learning I would say absolutely as 90% of what you learn will translate directly over to C / C++ coding which can be used for arduino and esp8266 programming for making your own sensors.
Know of any good sources on where to learn, feel free to post.
Free online course:
https://java-programming.mooc.fi/
YouTube videos by Bucky ‘the newboston’ are great as you can learn one topic each day in 10 to 30 minutes.
Free ebook on Java for the next few days…
Australia link
https://www.amazon.com.au/exec/obidos/ASIN/B019VIVR8K/ozbargain-22
USA link
https://www.amazon.com/dp/B019VIVR8K