By default, Gmail organizes your inbox into multiple categories to help you avoid spam and other unsolicited email, and get to the email that matters. However, to access these folders, you need to open Gmail, open the appropriate side menu, and then select the inbox you want.
You can greatly simplify the work by adding a shortcut to your home screen on the form. Once added, just tap the icon and you will instantly jump into the inbox of your choice.
To try it, long press an empty space on the home screen and then select "Widgets" from the menu that appears. Scroll through the list and look for Gmail.
Long press on the Gmail widget -Label "(it looks like a price tag) and drag it to your home screen. Then select the folder you want to quickly access when prompted. You can then rename the link if necessary. Then select "Done" and you will return to the start screen with the new shortcut. Just tap this link to jump straight to the folder!
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