If you upload a video or a part of a video that you do not own, you are more likely to get a copyright strike. The copyright owner will notify YouTube to take down your video and issue a copyright strike. This can negatively affect your channel.
First copyright strike
The first copyright strike acts as a warning. You will be required to go through YouTube's Copyright school for you to understand how copyright is enforced and how it can affect your ability to monetize and use other channel features.
Second copyright strike
Strikes expire after 90 days. Deleting the video won't resolve the strike. If you receive a second strike before the first strike expires, you will need to wait for the second strike to expire to restore your good account standing.
Third copyright strike
If you get a third copyright strike, your videos will be removed and your account, along with any connected channels, will be terminated.
How to get more information about the strike
Sign in to YouTube Studio.
From the left menu, select Content.
Click the down arrow above Copyright claims.
Click View copyright claim details.
How to resolve a copyright strike
Wait for it to expire.
Get in touch with the person who claimed your video and request a retraction.
Submit a counter-notification if you think your video was removed by mistake or qualifies as fair use.