Quartus II & edaplayground tutorial
Getting Started with Quartus II

2. You can also view my online verilog code for half-adder via edaplayground. I've shared a simple verilog code of half-adder and other designs here. Just click the provide links and I am pretty sure you like this interactive learning using online verilog editor-simulator. ENJOY

CLICK LINKS BELOW FOR MORE DESIGN USING VERILOG