There are two tiny bumps on the hair. How to approach it with clean topology?
First explain to me why you need to have “clean” topology.
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If you don’t need any deformation, you just need to cut the edges and use them.
If you need variations or animations with variations, you need a grid configuration.
In this case, you can use the edge-cut object to cut the grid object. (Need to clean up)
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haha, I just want to practice.
Thank you for the reply 
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Fair enough (and the right answer). 
I would suggest you soak your brain full with topology knowledge, then practice.
If you are interested in proper sub-D, all quads production modelling methods I’d recommend this channel:
https://www.youtube.com/@Elementza/videos
It’s Maya, but that’s irrelevant, they have some very good topology tutorials and the principles of it are universal.
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Organize the edges and fill the inside.
The link below is a topology lecture. (It’s a slow-paced lecture)
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As long as the card won’t be deformed during animation -do not overthink the topology. Use triangles if needed. When all vertices stay coplanar, it won’t affect the surface shading any way
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Thanks a lot!!! It helps~
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BTW, what are those green lines?
I put the edges for the topology roughly. 
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I MADE IT! It looks great now~~~
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