  We discuss implementation of the LHC experimental data sets in the new CT18
global analysis of quantum chromodynamics (QCD) at the next-to-next-leading
order of the QCD coupling strength. New methodological developments in the
fitting methodology are discussed. Behavior of the CT18 NNLO PDFs for the
conventional and "saturation-inspired" factorization scales in deep-inelastic
scattering is reviewed. Four new families of (N)NLO CTEQ-TEA PDFs are
presented: CT18, A, X, and Z.
