  It has been a great challenge to explore many-body effects in heavy fermion
systems with $ab$-$initio$ approaches. We computed the electronic structure of
UTe$_{2}$ without purposive judgements, such as intentional selection of
on-site Coulomb interaction and disregarding spin-orbit coupling. We show that
U-5$f$ electrons are highly localized in the paramagnetic normal state, giving
rise to the Kondo effect. It is also found that the hybridization between
U-5$f$ and U-6$d$ predominantly in the orthorhombic $ab$-plane is responsible
for the high-temperature Kondo effect. In contrast, the hybridization between
U-5$f$ and Te-5$p$ along the $c$-axis manifests the Kondo scattering at a much
lower temperature, which could be responsible for the low-temperature upturn of
the $c$-axis resistivity. Our results show that the electron correlation in
UTe$_2$ is orbital selective, which naturally elucidates the recent
experimental observations of anomalous temperature dependence of resistivity.
Furthermore, we suggest that the Kondo effect is suppressed at high pressure
owing to weak localization of magnetic moments, which results from enhanced
U-5$f$ electron hopping.
