Solution to brew not found error!
When you install brew in macOS it gets installed at the location - /opt/homebrew, in order to run the brew command you need to cd this location and get into the bin directory and run the brew commands.
The above solution will work but is not an ideal way of running the brew command, it's better to add the path of brew installation in the .zshrc file
Open the .zshrc file using command: nano ~/.zshrc,
Now add the following to the file: export PATH="$PATH:/opt/homebrew/bin/"
Save the file by pression Control + X followed by Enter.
Apply the changes by command: source ~/.zshrc