Go to the link below to open a copy of the colabcat.ipynb file in Google Colab: https://colab.research.google.com/github/someshkar/colabcat/blob/master/colabcat.ipynb
Click on Runtime, Change runtime type, and set Hardware accelerator to GPU.
Go to your Google Drive and create a directory called dothashcat, with a hashes subdirectory where you can store hashes.
Come back to Google Colab, click on Runtime and then Run all.
When it asks for a Google Drive token, go to the link it provides and authenticate with your Google Account to get the token.
You can edit the last few cells in the notebook to customize the wordlists it downloads and the type of hash it cracks. A full list of these can be found here.
If needed, simply type !bash in a new cell to get access to an interactive shell on the Google Colab instance.