Find a small glass jar with screw-on lid and keep a small amount of turpentine in it.
The opening should be sufficiently large to dip the brushes into it and have them soaked.
Wipe your brushes with a rag and repeat it until you judge the brush to be clean.
The jar containing the turpentine can be closed, even when it has taken on colour,
you can keep it until fully used up.
Follow this by cleaning paint remnants with water and soap.
To do this, rotate the hair or bristle points in the palm of your hand and when
they are showing foam you can be certain they are clean.

For drying place the brushes on a table edge.

If placed in a container when still wet, with the hairs or bristles pointed upward,
of course, the wood will expand due to the constantly penetrating moisture into
the brush handle and the ferrule will no longer fit firmly – it will wobble.

Now, work will really begin.

Mix your acrylic paint (ochre) in a small dish.
Use the brush handle to do this or something like a spatula or painting knife.
Do not use the brush point because too much compact colour will be taken up.
The same applies later all the more to oil paint.
Mix a sufficient amount and just as much as needed to lay in washes.
The paint should be watery and leave no raised surfaces when applying.
However, the washes may be textured or streaky.
At a later stage you will employ this effect intentionally.

When working with acrylic paint, always clean the brush and close the tube immediately.
As already mentioned, acrylic paint dries quickly and if dried out can no longer be used.