This would allow you to align elements like text, images or stickers with greater ease instead of trying to 'eyeball it'. (Similar to how Canva or Adobe does this on their design interface) When an object is selected and you are moving it around the page, a line will appear alongside another element on the page, and the object will stick to that line when you move it close, indicating that it has snapped into the same position.

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Make an option when turned on it shows magnetic dots in the cross-hair of square paper or on the dots of dotted paper.
Line drawing by hand will snap in between two dots.

Advantage :
- Easy to draw geometry

Disadvantage :
- Might be annoying to write when the option is still active

Allow for the shape, pen, or highlighter snap feature to instinctively recognize an intersection of polygons, lines, or just a plain dot. This feature is mainly focused on imported documents and images. In the image below is a triangle (redrawn for clarity) where at each corner, the blue do for the highlighter snap shape is not at the corner. The snap tool should detect intersections, such as for a grid line or corner of a polygon, and automatically move to the intersection.

I would love to have the option to have a "magnetic grid" used in combination with a geometric form tool to draw some lines that start exactly at the corners of the grid.