As you can see in this picture, the edges are very rough because ive used the the brushes with background color. What I want to achieve is the perfect curve for this angle. I tried to edit the brush settings but it's too complicated for me. Is there any easy way to do this that doesnt involve creating the curve with a mouse because that seems impossible for me.
Thanks
As Joonas noted in his comment, use the pen tool to create precise curved shapes. The pen tool uses vectors - mathematically defined shapes that can be styled by fills and strokes - to create precise artwork that can be scaled to any size without loss of resolution. They are resolution-independent - although when displayed on screen you may still see "pixelation" as this is an artifact of your screen rendering a vector graphic and not of the actual vector graphic itself.
In Adobe's software packages (Illustrator, InDesign, Photoshop), these vector tools use bezier formulas to determine the curves - thus you may hear them referred to as bezier curves, bezier points, etc.
