Attributes are used to describe the features of a product and help your customers easily find what they want.
1) First, add an attribute group by going to Catalog.

2) Hover over Attributes.

3) Then click Attribute Groups.
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4) Click Insert.

5) Type an Attribute Group Name.

6) Enter the Sort Order.

7) Click Save.
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Now let's create a new attribute for the group.
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8) Go to Catalog.

9) Then Attributes.

10) And click Attributes.
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11) Click Insert.

12) Type the Attribute Name.

13) For the Attribute Group, select the new group we created.

14) Click Save.

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That's it! Now you know how to add attributes and attribute groups in OpenCart.