Fonts: Adobe Typekit (now free) also well known Google fonts. Avoid dafonts and similar to it like a plague.
Icons inspiration: the noun project.
Some designers share free resources on Behance as self-promotion. You can search there too.
Be aware of Dribbble and other platforms. While it's cool search for inspiration, a good designer follows users needs, not the hype or trends.
Lastly, for any real professional work I hire illustrators or other professional profiles to the job, and if there is no budget for that then quality stock resources.
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