Your bobbin thread is likely to bunch up regardless if you are a beginner or not. Bunching happens. But you can resolve this. You have to make sure that you do not pull the fabric right away. Take time to cut through the excess thread instead of pulling it loose. Pulling can cause damage to your machine and your project. Here are some ways to solve this issue. First things first. Check if the bobbin has proper threading. If not, you need to remove it from the case and re-thread it. Follow the manual of your machine on how to thread it. Always check the needle and thread you use for your fabric. Each fabric needs specific threads and needle styles and sizes. Make sure that you use the same thread in both the top and bobbin threads. If you use different threads, there will be opposing tensions. Your machine will tend to pull on them at different rates. This will cause bunching. Another reason for bunching is the loose bobbin case. This could be due to a loosened screw. You must adjust the screw and pull the bobbin thread bit by bit. You will feel some resistance, but as you continue the thread will move with less and less tightness. Before you start sewing, make it a habit to check if the bobbin and the bobbin case are in the proper position. Improper placement can cause thread bunching. Always clean the bobbin area, the case, its compartment, and thread. You can use a small brush to remove thread fibers and lint. Check if the bobbin thread is not too loose, or it did not come out of the compartment. If it did, you need to re-thread the bobbin. Follow the manual for proper guidance on re-threading.