  In this paper, we develop systematically the pointwise regularity for
viscosity solutions of fully nonlinear elliptic equations in general forms. In
particular, the equations with quadratic growth (called natural growth) in the
gradient are covered. We obtain a series of interior and boundary pointwise
$C^{k,\alpha}$ regularity ($k\geq 1$ and $0<\alpha<1$). In addition, we also
derive the pointwise $C^k$ regularity ($k\geq 1$) and $C^{k,\mathrm{lnL}}$
regularity ($k\geq 0$), which correspond to the end points $\alpha=0$ and
$\alpha=1$ respectively. Some regularity results are new even for the linear
equations. Moreover, the minimum requirements are imposed to obtain above
regularity and our proofs are simple.
