Need help in some basic knowledge

I need to know how to get into WiFi of my neighbors i have tried basic passwords for there ssid bit is there anyway I could obtain the key or change it somehow

I can help you out with this, but it'll require some effort from your side.
If you want i can give you a step by step on how to do it, but it ain't free chief

Try to use Airgeddon, with Parrot OS.
try to get the handshake with the wifi network of ur neighbours.
You will get a .cap file once you've captured the handshake, then use an attack mode to get the pass.

Blesser's got the right idea. You can also use aircrack-ng which works fairly well. It all depends on the encryption of their router