2.PS is mainly for pixel pictures. Specifically, as long as it is a pixel-like picture, it will become blurred or mosaic after enlargement. PS is mainly used to correct photos or pictures in advertisements, and can also be designed.
3.Coreldraw is mainly aimed at vector graphics, which can be enlarged immediately without blurring. This is one of its characteristics. Generally speaking, in advertising or graphic design, it is mostly used for the design of fonts and logos, which has a wide range of uses (AI can also be used instead). Secondly, Coreldraw has inherent advantages in typesetting.
Generally speaking, if you can't express Coreldraw, it's hard for advertising companies to accept it, but I think if you have the software foundation of PS, you should learn CDR quickly. It's better to spend a few days learning. The general principle is the same.