You can usually post it on YouTube or Soundcloud, but you cannot monetize it or put it on Spotify/Apple Music without buying a license.
If you are using a "Free Type Beat" from 2021, you must be aware of the Standard Licensing Terms : You can usually post it on YouTube or
Add a bit of "warmth" or "grit" to your voice so it matches the "Hard" aesthetic of the instrumental. You can usually post it on YouTube or
Don't fight the beat. Listen to the snare (usually on the 2 and 4 or the 3 count). Your rhymes should land on these beats to stay "in the pocket." You can usually post it on YouTube or
To freestyle or write effectively, you need to recognize the "Skeleton" of the beat, as described in guides like Melodics' Beatmaking 101 .