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I enjoy using Gmail because it's free, has a large amount of storage, and you can make scripts to keep your inbox tidy,  but you don't need to be a senior developer to create one. Here are some steps to create your own script to maintain your inbox.

• Log into your Google account.

• Go to Google Scripts and click on Start Scripting to create a blank project.
• Click on Untitled project and give it a name.

• Copy and paste the following script in the Code.gs tab (copy over default myfunction) :

function auto_delete_mails() {  
  var label = GmailApp.getUserLabelByName("Delete Mail");   //This is the label you assign to a message in your Gmail account's inbox
  if(label == null){
    GmailApp.createLabel('Delete Mail');
  }
  else{
    var delayDays = 30 // Enter # of days before messages are moved to trash   
    var maxDate = new Date(); 
    maxDate.setDate(maxDate.getDate()-delayDays);    
    var threads = label.getThreads();  
    for (var i = 0; i < threads.length; i++) {  
      if (threads[i].getLastMessageDate()<maxDate){  
        threads[i].moveToTrash();
      } 
    } 
  }
}

• Update the  delayDays to the number of days messages are to be removed from your inbox.
• Save. It will create a "Delete Mail" label that you can use to assign an email for it to auto delete from your inbox.
• Set trigger through Resources>Current Project's Triggers> Add one now to run it daily.

Now, you can label an email after reading it for your helpful script to keep your inbox tidy and free of old messages.