Invoke either of the following commands if the formula is hosted at GitHub

$ brew install manikmagar/tap/<formula>

Or

$ brew tap manikmagar/tap
$ brew install <formula>

Invoke the following command if the formula is not hosted at GitHub

brew tap manikmagar/homebrew-tap 
brew install <formula>

Invoke either of the following commands if the cask is hosted at GitHub

$ brew install --cask manikmagar/tap/<cask>

Or

$ brew tap manikmagar/tap
$ brew install --cask <cask>

Invoke the following command if the cask is not hosted at GitHub

brew tap manikmagar/homebrew-tap 
brew install --cask <formula>

If you get a dialog stating the cask is broken try installing with --no-quarantine.

brew help, man brew or check Homebrew's documentation.