Hello
If you are looking for poster paint ? Then, this is the place where you can find some sources that provide detailed information.
poster paint
How To Create A Poster | Adobe Photoshop Tutorials
Araújo began by opening a previously saved poster-sized file with a background image that simulates the look of paper grain. He placed a black texture image in the lower-right corner and used the Rectangular Marquee (M) to select part of the new texture. Then, he applied a layer mask and painted with a black textured brush to create a ragged ...
https://helpx.adobe.com/photoshop/how-to/create-poster.html
I hope the above sources help you with the information related to poster paint . If not, reach through the comment section.