If you are planning to create a Youtube video, shoot the video in landscape mode. If you want to share your videos on Facebook or Instagram stories, then a portrait mode is preferable.
If you are not sure where you will be posting the video, you can shoot vertical and then change the video aspect ratio in Premiere Rush later.
For more information, see Change video aspect ratio.
Premiere Rush on iOS offers advanced video capture capabilities that provide you DSLR-like options to adjust ISO, white balance, shutter speed, frame rate, and more.
For more information, see Create and share videos on the go using Adobe Premiere Rush CC on iOS.
If you are filming using your mobile camera, try to move closer to what you are filming rather than zooming in, which can cause loss in quality.
If moving closer to the action is not an option, consider whether you can crop the footage while editing. For more information, see Crop and rotate a clip.
If you plan to record sound with your video, make sure you do a quick sound check before starting to capture video. Doing a sound check makes you aware of any ambient noise or weird echoes that the camera is picking up.
Note, you can always edit out background noise and remove echoes while editing. For more information, see Refine voice clips.
Learn the keyboard shortcuts you can use for editing. Knowing the keyboard shortcuts can speeden up your editing workflows.
For more information, see Keyboard shortcuts.
Adding music and sound effects is the easiest way to add depth and layers to your project. Take advantage of the free soundtracks available with Premiere Rush, or add your own music. You can also record voiceovers while editing your video.
For more information, see Add and refine audio.
Your video thumbnail and title is what gets viewers to click on your video (if you are sharing on YouTube).
Use a high-quality still image or video as your thumbnail. Also, make use of professionally-designed Motion Graphics templates available on Stock to get your video more visibility.
For more information, see Share your video on your YouTube channel.
When you upload a new video to YouTube, add an annotation or a note in the description asking your viewers to subscribe if they like your clip.
Note: Not all viewers will subscribe simply because you are asking, but there are a lot of people who will subscribe because you are asking when they may not have thought of doing so otherwise.