There are many ways to take a screenshot on the Google Pixel 4a phone and a few more cool tips tricks and best hidden features to rapidly get a screenshot:
Gesture
Use Capture+ icon at notification bar
Use buttons
Google Assistant
Install screenshot app from Google Play
We understand that you are smart. Therefore, there will be no teaching such as select the screen you want to capture or switch on your device. No crap. Exclusively the essential information how to make a screenshot on the Google Pixel 4a phone.
Use buttons
Probably the easiest way to take a screenshot is to use the buttons. You can simultaneously press the Volume Down and Power buttons and hold them down until the screenshot is captured. You can also use this method to make a scroll screenshot.
Click to zoom in
If the first way to take a screenshot not work and you can't find picture let's go further.
Google Assistant
The laziest way is to use Google Assistant. Just say OK Google and then Take a screenshot. The gadget will do everything for you.
Use apps
You can use additional apps for screenshots which are a lot in Google Play: Screen Master, Screenshot Easy, Private Screenshots, Screenshot touch, Screenshot Pro etc... They all have instructions on how to use them to make a screenshot and save the picture.
Use Power button
Hold down the Power button for a few seconds, then touch the Screenshot icon at the bottom of the screen. The screenshot will be captured.
Click to zoom in
How do I share my screenshots? Depending on the Android version and the built-in shell, sending screenshots may differ. In new versions of Android (9 or 10), the smart menu will arise after you take a screenshot immediately. There you need to choose the appropriate icon for sharing. Or just open the gallery app on your phone.
Where are screenshots saved? If you can't find the screenshots you took, don't despair. The phone can save screenshots to different folders. Again, it all depends on custom shells. A pure Android throws pictures into the gallery (DCIM). Other shells can save screenshots to a separate folder for your usability. These methods work with gadgets of all operators.
Cricket Wireless
T-Mobile
Sprint
TracFone
Verizon Wireless
Simple Mobile
Virgin mobile
Metro
AT&T
Your phone has a screen resolution 1080 x 2280 pixels. And so the screenshot will be the same size. And the file size will be 0.3 MB, so count how much space you need in your phone's memory or on your SD card.
The video or images in this post may not be your phone number. But, they have typical parts that will help you get the required result.