First start off with a dome shaped head and add a beak. (Short beaks are easier)
Draw beady black eye.
Draw feathers which look long when a bunch are grouped up together and form them into wings.
Draw tail feather and skinny legs.(you can draw a tree/stick or something if you want it to look like its perched on a branch)
And now you're finished with a simple bird!
There are many different types of birds with different shapes and sizes. Experiment with some different birds and maybe sketch a little cartoony one if you want too!