How to install netbeans on raspberry pi?
Any file that ends .sh is a Bash script. Look at the properties of the file (file manager program might be easiest way) and tick the box to make it executable. Then make sure you are connected to the internet, open a terminal window, change to the directory where the netbeans script is, and type ./netbeans etc (dot-slash-name of the script file) and press Enter. That will cause the netbeans install script to run. Watch the messages - Google anything that looks like an error.