The right side of the screen, if you're on a server or group DM, will be the list of members on the server and their roles.If you're on the Direct Message screen without a chat open, it will either be the Activity page or your Friends list. The center of the screen is the chat messages.Underneath these lists will be your username and profile image, your 'online' status, whether your microphone is muted, whether your headphones are 'deafened', and your settings.The left side of the screen will be either your Friends List or a list of channels in a server, depending on whether you're on the Direct Message screen or a Discord server, respectively.The far left side of the screen is where Direct Messages will show up and where any servers you've joined will show up.The basics are easy enough to learn, too! However, a lot of it is really just learning how to use the layout. If you've never used Discord before, or aren't very familiar with instant-messenger apps in general, you may be a bit confused on how to use it. Familiarize yourself with Discord's layout.

Discord browser app