Hello,
When I am studying my new cards and I press hard or any other option, the card goes away and does not show up in the learning pile so I never see them again. Please help me 
Hello,
Do they show up eventually (the next day) or they never show up again?
Are you using the custom study option?
If they used to show up immediately but now they show up later, try this:
This is because you have selected “use recommended settings” which automatically sets the learn ahead limit to 0.
To fix this, basically find what is your “again” button minutes. For example, if your again button is 10 minutes, set your learn ahead limit to 11 minutes.
You can set your learn ahead limit by going to Anki at the top left → Preferences → Review → Learn ahead limit