You likely already have the tools you need pre-installed on your Macbook.
Paint S is an easy-to-use drawing tool and image editor for Mac. Sketch, draw, and edit images with a simple and powerful toolset. Is there a Paint for Mac? - Setapp
Included in modern macOS versions, Freeform provides a flexible canvas where you can draw, add shapes, and insert images, often surpassing basic Paint features.
Microsoft Paint is a native Windows application and does not have an official macOS version. If you are looking to "download MS Paint for Macbook," you won't find a direct installer from Microsoft, but you can achieve the same functionality through built-in tools, web-based clones, or dedicated third-party alternatives.