This 2048 number game strategy can be broken down into a few key elements:
1. Use only two directions (as much as possible)
2. Never move your tiles up
3. Keep your tiles tidy
4. Focus on your goal
5. Combine downward and horizontally as needed

Use Only Two Directions

The number tiles can be moved in 4 directions. To keep the tiles in the lower left of the screen, you can move your tiles down and left with essentially no risk.

So the goal is to trap a higher number on the lower left side and try to focus on the lower left corner.

Never move your tiles up!

Never use the word never right? You should avoid moving your tiles up at all costs. Moving your tiles up when you do not absolutely have to will cause endless problems. Sometimes you have to, but if you have any other alternatives, take it.

Keep your tiles tidy

Keeping your tiles to the lower left is not the only element. You should also keep your highest tiles to the bottom left.

Focus on your goal
Sometimes you will get caught up in the action of combining the tiles and you will lose the forest for the trees. Focus on the value you need to increase a tile to then you will get a better outcome.

Combine downwards and horizontally as needed
If you have your tiles tidy as mentioned above then you should combine aggressively downward then tidy your tiles back up.