If you're using an Ubuntu laptop or desktop, you can press Ctrl + Alt + T on your keyboard to open a new terminal window. If you're using a remote Ubuntu server, you can connect using SSH to open a new terminal session.
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The -h option tells the command to show "human friendly" output (using familiar units like Gi for Gigabytes and Mi for Megabytes).
You should see output like:
total used free shared buff/cache available Mem: 1.9Gi 1.2Gi 146Mi 11Mi 637Mi 601Mi Swap: 0B 0B 0B
The first line (Mem:) shows the physical RAM available (total), used, and available (free).
The second line (Swap:) shows the amounts of swap memory.