What websites do advertising companies usually look for as design materials _ What advertising materials websites are there?

Recommend several well-known domestic material websites.

Big picture. Com is a good free information website. Its advantages are better data quality and faster data updating.

Love map. Com, an old website with a lot of materials. There are many materials, most of which are free, and many pictures are packaged materials.

Siyuan forum has a lot of studio materials, PS materials and design materials, and it is the best one in China. You can also learn PS tutorials and design skills.