The prototype Large-Sized Telescope (LST-1) of the Cherenkov Telescope Array
(CTA) was inaugurated on La Palma, Canary Islands, in 2018. Since then the
telescope is in the commissioning phase and takes regular gamma-ray data on astrophysical
sources while waiting for other CTA telescopes in La Palma to be constructed.
In this colloquium I present the status of the commissioning, lessons learned, the
telescope performance, and scientific highlights achieved in the last couple of
years. The science results include the detection of active galactic nuclei flares,
studies of pulsar wind nebulae and pulsars, the detection of a Nova, and searches for gamma-ray
emission from gamma-ray bursts. I will also present the status of the
construction of the three further LST telescopes (LST-2-4) in La Palma and plans for their commissioning.
