Lua: (Note: if you have mac or linux, lua is probably preinstalled)

 https://www.lua.org/pil/contents.html  <=== Lua official tutorial
    https://www.tutorialspoint.com/lua/lua_basic_syntax.htm  <=== another great tutorial
    https://dev.to/jd2r/the-lua-tutorial-544b


Rust:

 https://doc.rust-lang.org/book/ <=== official
 https://doc.rust-lang.org/rust-by-example/  <==official


Java:
 https://www.w3schools.com/java/  <=== W3schools have ton of great resources for almost every programming language
 https://dev.java/learn/  <==== lot of guides
    
    
Perl:
 https://www.tutorialspoint.com/perl/index.htm
 

C:
 https://freecomputerbooks.com/top-c-books.html  <== free books
    
   
Bash (shell scripting):
 https://www.freecodecamp.org/news/bash-scripting-tutorial-linux-shell-script-and-command-line-for-beginners/
 https://linuxhandbook.com/bash/
    
    
    
 FOR MORE RESOURCES, CHECK MY OTHER THREAD: https://nulledbb.com/thread-Free-programming-ebooks   
   
   
Lua - more lightweight, maybe some terminal automation or utilities
Java - runs in JVM, more heavyweight BUT built in GUI and other useful libraries.
Perl - more oldschool, one of preinstalled language son linux
C - Hard, more control of computer (malware is written in C)