This is for users who needs help coloring the lineart of a logo or something. c; During this time, I am using MediBang Pro. Fast and easygoing buttons c; Let's go!
1. Go on google and look up for some image of a transparent logo. It could be anything, but for now I am using a camera logo.
2.
https://www.freepnglogos.com/images/camera-logo-png-7465.html 
3. After successfully pulling up the PNG image, you can start outlining.
4. Open your software - MediBang - and upload the image
5.
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6. Now you want to do is click 'Protect Alpha' on
Layer 17. New layer
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8. Now that you have a new layer, you will need to click on the box that says 'Clipping' on
Layer 2. Once you have done that, you can start coloring.
Hint: Using the bucket tool would help you 20x time better
9.
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10. And you're done! All you have to do now is Export it to a PNG transparent image.
Aha! You did it <3