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Carbocations are species bearing a formal + charge on carbon. The have sp2 hybridization and trigonal planar geometry, with an empty p orbital on carbon, perpendicular to the plane containing the substituents (see diagrams shown to the right).
So, this carbon, is our sp2 hybridized carbon now, and you can see it's planar around that carbon. And, this is a tertiary carbocation. We have a methyl group here, a methyl group here, and then an alkyl group over here. So, a tertiary carbocation is more stable than a secondary. You can also see at this carbon now we have an sp3 hybridized carbon here, so the geometry around that carbon is tetrahedral. It went from being planar to tetrahedral geometry.