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What is your goal/aim? Java or C++ are both pretty good languages.. Python seems to be a popular first language.
There are numerous tutorials for all the above languages on both youtube and on google/duckduckgo.
What are Java, C++, and Python?
I don't really know what goes on under the hood, but I'll share what kind of applications you can make with them based on my experience.
You can use them to do a lot of repetitive tasks extremely efficiently; like to perhaps calculate the sum of prime numbers between 1-1,000,000.. or other problems at projecteuler.net. The possibilities are really limitless.. you can have a program generate 100,000 names, and print them to a text file. Another program could read in that text file and alphabetize it.
You can make programs that play music, games, use cryptology, sternography, Image IO (input / output), read/write files, have GUIs, utilize databases. It's a big world.