It's challenging to pinpoint a single "best" website for free graphic resources, as preferences and needs vary among designers and creators.
However, we can mention a few popular and highly-regarded websites that offer an extensive selection of free graphic resources and high-resolution images:
Freepik: Provides a vast collection of free vectors, PSD files, icons, and photos.
Pexels: Renowned for photos and also offers a good selection of free stock videos.
Pixabay: Provides free vectors, illustrations, and videos in addition to photos.
Canva: A graphic design platform that offers a selection of free elements like icons, photos, and templates.
Unsplash: Though mainly a photography website, Unsplash has a growing collection of free illustrations and vector graphics.