How to move your mails from one Gmail to another Gmail account?

We are all almost have minimum 2 Gmail accounts. We had used one account in college days or school days with some funny super hero's names or nickname but now we have created another account for professional purposes. So still some valuable emails are stuck in that our old accounts. So Now we are going to collect all the memorable, valuable and useful emails in one Gmail account. So no need to login you old Gmail to catch some emails.

1.Login to Gmail account, Which account emails you want to move to another account

2. Click on the settings button which located below to your profile picture. Choose settings.

3.On Settings Header bar click Forwarding and POP/IMAP

1. Enable POP for all mail
2. At below, Change marks Gmail copy as read.
3. Don't forget to click Save Changes

4. Go to your another Gmail account, To which one you want to keep all emails

5. Go to settings, Click Accounts and Import

1. Click Import mail and contacts
2. Now a popup will be open, Provide Gmail address of an account which one you want to move here. Click continue.
3. On next page, Click continue. It will open one pop window for authentication. So provide your password and click allow and add that account.
4. Once authentication is successful, On the first popup section now it will redirect to import page.

Now choose the option you want to import into your desired account and Click Start import.

That's all, now all the contacts and emails were imported into your new Gmail account.