For basic install and use, please refer to official doc. I'll start from finding elements.

A. Find elements using poco

pip install pocoui (hint: not pip install poco, that's a different framework).
You can get elements UI tree by Airtest IDE.

1.using name

use element's name from UI tree directly
button = poco('ConfirmButton')

2.using other attributes

You can find other attibutes like type, visible or text by clicking the element from UI tree, and you can locate the elements with these attributes.
button = poco('ConfirmButton', text='OK')
button = poco('ConfirmButton', type='Button')

3.using relative relation to locate elements

You can use relative location to find the elements, for example:

poco("plays").child("playBasic").offspring("star_single")

more relative location method

child() direct child(ren), if more than one child is matched, poco('xxx').child('yyy').click() will operate on the first 'yyy' child element
children() direct children(all children)
offspring select the offsprings including the direct child(ren)
parent() select the direct parent
sibling() select the sibling(s)

4.using index to locate elements

If .child() finds more than one elements, you can use the index to locate them one by one

btn0 = poco('xxx').child('Btn')[0]
btn1 = poco('xxx').child('Btn')[1]
btn2 = poco('xxx').child('Btn')[2]

5.using regular expression

select the UI element whose text attribute matches the pattern '^close.*$'

close_btn = poco(textMatches='^close.*$')

and name can also be matched by nameMatches

poco(nameMateches='.*Title$')

B. Find elements using Airtest

1.snapshot

get the snapshot of the target element, named as 'target.png', and you can click(touch in Android or iOS) it like:

touch(Template(r"target.png", record_pos=(-0.021, 0.121), resolution=(900.0, 1600.0)))

2.set the threshold

there's a threshold value to help filter the image finding results. When it's lower, it means it's easy to find incorrect image and when it's higher, it means it will only find highly matched images.
We can set the global threshold like this(the default value is):

from airtest.core.setting import Settings as ST

ST.THRESHOLD = 0.7  # used in finding elements
ST.THRESHOLD_STRICT = 0.7  # used in assert

if we want to set dedicated threshold for one element, we can set like this:

touch(Template(r"target.png", threshold=0.8, record_pos=(-0.021, 0.121), resolution=(900.0, 1600.0)