Where could I get minecraft?

Buy it from minecraft.net.

Softonic.com

You can get it from mojing.com
Or reaserch minecraft. Ask your parents and also be aware there's a cost

Create a account at minecraft.com and by the game there

Minecraft.net is the easiest way if you are willing to pay for it. You can also find free cracked versions online but I don't advise trying to download them because of malware and viruses being common with these downloads. Also, the cracked versions may not run properly.

Minecraft.net

Your mom