But these forums don't help folk create a DDoS so don't expect help creating a hack tool.
So for example, to DDoS your PC from the internet isn't directly possible but they can flood your internet IP address. Imagine the usual army of remotely controlled PCs. They only need about a hundred PCs to ping your IP address. That would do it.
Now there are longer explanations on the web, so next time tell why you asked this. It's not a new question so what's new to you.
How do DDoS attack work on non-server ?