  The Gaia DR3 parallax approach was used to estimate the absolute parameters
of 2375 Delta Scuti stars from the ASAS catalog. The selected stars have a
variety of observational characteristics, with a higher than 80% probability of
being Delta Scuti stars. We have displayed all the stars in the
Hertzsprung-Russell (H-R) diagram along with the Delta Scuti instability strip,
the Zero Age Main Sequence (ZAMS), and the Terminal-Age Main Sequence (TAMS).
Then, we determined which fundamental and overtone modes each star belongs to
using pulsation constant (Q) calculations. In addition, we evaluated the
parameters in the Q calculation equation using three machine learning methods,
which showed that surface gravity and temperature have the greatest effect on
its calculation. The Period-Luminosity (P-L) relationship of the Delta Scuti
stars was also revisited. Eventually, using least squares linear regression, we
made four linear fits for fundamental and overtone modes and updated their
relationships.
