  We review the recently proposed Trans-Planckian Censorship Conjecture that
stems from the Trans-Planckian problem of cosmological perturbations. We
analyze the implications and constraints that TCC introduces in different
frameworks of viable inflation. We revisit the case of slow-roll scalar field
inflation and we investigate the cases of slow-roll $f(R)$ and
$f(R,\phi)$-gravity. Finally, we consider the conjecture in the context of
constant-roll scalar field inflation.
