This document summarises Petra Bacova's notes on linear rheological measurements undertaken during her secondment at IESL-FORTH, Heraklion, Greece. This secondment aimed to provide her with training in experimental rheological techniques. This experience was used for the detailed rheological characterization of commercially available poly(lactic acid) (PLA) and unentangled PLA samples synthesized at the University of Cádiz. The notes are fully based on Petra Bacova's experience, are meant to be a basic guide for beginners and should be used with care when applied to other samples in melt or other machines than ARES of TA Instruments.