There are some really advanced animation tools that game companies use. To start off with the basics, Roblox animations for characters is a great place to begin.
Watch the video below, occasionally pausing to try the steps yourself.
To Save your animation, click the 3 dots.
First click Save to save the animation to this game.
Second, click Export to send it to the Roblox server.
Once you save the Export this screen will show up. Click the link to see your animation on the Roblox website. Copy that link and save it in a Word Document or Text Document. Upload that link file to complete this activity.