To update your keyboard, head to your Samsung phone's Settings app, and then tap on "Language and input". From there, select "Samsung keyboard" and click on "Update". You'll be directed to the Galaxy Store, where you can download the latest keyboard updates.
Make sure you're connected to Wi-Fi, as you'll need a stable internet connection to download the updates. It's also a good idea to back up your data before updating, just in case. Don't worry, it's a quick and painless process!