Filter Contacts
In the Contacts section, you can see all the contacts in your account. To export them, all you need to do is filter the ones you want to export. You can check how to do advanced filtering to your contacts, or you can simply export them all.
Choose the Columns
You can choose the columns that you want to export. Choose the columns you want to include from the right-hand side of the page.
Export
After you select the columns you want to include, those will be visible on the contacts page. After that, you need to go to More and click Export. If you cannot read your export, you can check out the "Why I Can Not Read My Excel Sheet?" article.
Decide Columns to Export
You'll see that you have two different options here. You can either export with the displayed columns or export with all columns.
After you export your contacts, the export file will be automatically sent to your email.
Congrats!
If you don't know how to find export files later, you can check the article How To Find The Export Files.