Most of the features provided in Discord are for free like texting, sending images/videos, creating your own servers and channels, or adding members to your server.
But some features are only available in Discord Nitro like you can
upload larger files
access to more emojis
1080p@60FPS streaming
profile customization
can boost your server
1| Discord Nitro Free Trails:
If you are new on discord and have never bought a Nitro, then this might be your chance. Discord time to time releases a Nitro Offers.