Start by controlling water
Practice dry brush, wet-on-dry and wet-on-wet strokes on the same sheet. Notice when an edge stays defined and when it blooms: that difference is the basis of most watercolor effects.
Six revealing exercises
Make one-colour gradients, mix two tones on wet paper, lift paint with a clean brush, reserve lights with the paper white, try splatters and paint one simple negative shape. Repeat each exercise with less paint and more water.
Turn practice into a routine
Spend fifteen minutes on one technique and write down the amount of water that worked. A test notebook is more useful than chasing a finished work on day one; it helps you recognise your mixes and repeat successes.
The first layer
Start with light mixtures and let the paper white do part of the work. It is easier to deepen a shadow with a second layer than to correct a mark that is too dark.
Hard and soft edges
Paint a defined edge on dry paper, then touch it with a clean damp brush. This simple gesture creates soft transitions and gives you control over volume.
Mix on the palette
Prepare enough mixture before covering a large area. Test the colour on a paper margin: when dry, watercolor often looks lighter than it does in the palette.
Finish with a thumbnail
At the end, paint a small scene using only two or three techniques. Do not chase perfection: the goal is to decide which tool works best in each part of an image.