YouTube channel banner and channel art are an important aspect of branding your channel and making it stand out. Here's a step-by-step guide on how to upload them:

Step 1: Sign in to your YouTube accountTo upload your YouTube channel banner and channel art, you'll first need to sign in to your YouTube account.

Step 2: Navigate to the "Settings" menuOnce you're signed in, click on your profile icon on the top right corner of the screen, and from the drop-down menu, select "Settings".

Step 3: Click on "Appearance"On the settings page, you'll see the option for "Appearance" click on it.

Step 4: Click on "Add channel art"On the "Appearance" page, you'll see the option to upload a banner. Click on the "Add channel art" button to upload a banner for your channel.

Step 5: Select a fileYou'll be prompted to select a file from your computer. Choose the image file that you want to use for your banner.

Step 6: Crop and adjust the bannerOnce the file is uploaded, you'll be able to crop and adjust the banner to fit the recommended size of 2560 x 1440 pixels. Make sure that the important parts of the banner are not covered by the text and other elements.

Step 7: Save ChangesOnce you're satisfied with the banner, click on the "Save" button to save the changes.

Note: You can always change your banner later by repeating these steps. Also, be mindful of the recommended size and format of the banner, and the file size of the banner should be under 2MB.

By following these steps, you can easily upload a YouTube channel banner and channel art. This can be a great way to give your channel a professional look and make it stand out. A good banner can be a powerful tool to grab the attention of potential viewers, as well as to present your channel's theme and style. Make sure to choose a banner that represents your channel's content and identity, and that looks great on all screen sizes.