How can I quickly learn Minecraft plugins and how to code them? And what program do you recommend for that?
Not with such a setting.
So if you want to code fast, practice is announced. There's no other way.
If you are looking for a program to code Minecraft plugin I can recommend Eclipse => https://www.eclipse.org/.
If you are looking for a site to learn, I would recommend to gain basic Java knowledge => http://www.gailer-net.de/tutorials/java/. That helped me a lot back then. (I've only learned Java for 14 days in 2-3 hours…)
Thanks for that ^^, if you need help, you can also ask directly here or in Spigot => https://www.spigotmc.org/...ar.332028/