Acrylic and oil are binders letting the colour pigments
adhere to each other and to the painting surface.
Acrylic can be thinned with water and is no longer water soluble after drying.
This makes for problem-free retouching without further diluting the applied paint.
At first it is of advantage that the paint dries quickly.
There is no need to wait and one can continue to work on the newly applied paint.
(Tempera, another binder, has the same properties).
Oil paint, on the contrary, dries slowly.
Again, the advantage lies in being able to work longer on a wet paint layer - to create,
for example, soft gradation and subtle shades.

Why then not combining acrylic and oil paint ?
This is the painting technique employed by Old Masters like Dürer, Altdorfer
or Vermeer for their oil paintings.
However, acrylic has not been around for so long.
They used tempera underpainting (Old Masters layer technique).
But modern painting builds on this technique as well.
Painters use it individually, differently for any style.
It is, of course, possible to start straight away painting with oil.
The pros and cons of this procedure are open to debate.
It is possible to use this approach or an entirely different one.

In addition to a motivation to paint, you need a painting surface.
Classical painting surfaces are panel and canvas which are primed with chalk pastels,
white and a binder blend. Painting surfaces can also be bought at low cost.
In the beginning, painting pads, for example, are recommended.
They are primed and work can start immediately.
Acrylic and oil primed pads are not recommended at the start.
A simple used saucer or a tile can serve as palette.
It is important that the oil in the paint is not absorbed like by blotting paper.