Hello @4mylgl6 ,
@tobor8man is correct–these wont make a lot of sense to you until you understand the program fundamentals. I would recommend studying the introductory documentation and classroom resources before jumping in.
However, off the top of my head, for this I would:
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Shape the chocolate as desired. Create it from a subdivided primitive that has separate polygroups for each side. This will be important in a moment.
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The Knife Curve brush might be useful for removing the “bitten” sections of geometry.
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ZRemesh the mesh to clean up the geometry. Use the “Keep Groups” option, and the model will retain its polygrouping and draw clean edges along the borders of the polygroups. The “bitten” sections will also retain a separate polygroup if they were cut with the Knife brush.
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Check the resulting mesh with Geometry> Mesh Integrity> Check Mesh for errors.
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Crease the edges of the polygroups so they stay crisp when subdividing.
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Subdivide the cube sufficiently so the surface can receive the detail from Noisemaker when it is applied.
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Hide everything but the “bite” polygroup, and apply some noise to it as actual geometry with Noisemaker. Likewise sculpting with Alphas or the Clay Polish feature may also create the effects you’re looking for there.
The following is a quick example without any artistry:
Good luck!