If you want to rank your videos then you have definitely listened about SEO. If not, Read this article.
Content is the main topic on which YouTubers should be focused on.
Factors Affecting Content
#1. Original content:
Your video should be made by your own. Don't use other video as they will make a bad impact on your channel and YouTube will not rank your video. Making original content will be beneficial for you and your channel. Using other's video for profit is illegal and will get you in trouble.
#2. Quality
Another factor is quality of your video. Always try to make your video 720p, 1080p and greater as they will rank higher. Even Viewer will also like to view quality video with higher resolution.
#3. Audio
Always try to make your voice clear and turn background music low or I recommend to not use background music if you do voiceover on your videos. Viewer should know what you are saying.