How to display attributes in product page?

You can add attributes to products under Edit product > Miscellaneous > Attributes.
Once the attributes are created, follow the steps:

1. Go to Design theme > Design section.

2. Click on More variables > Miscellaneous.

3. Click on Sidebar sections. Add a key value pair “filters:Apply Filters” separated by a comma from other key value pairs.

4. Save all changes.

You can add the attributes via CSV file also, For example, if you want to give a Size attribute, follow the steps:
In the column attributes, change it to attributes.Size and then specify the size of each product. You can add more columns and can give different attributes. For example, attributes.Sleeves, attributes.Fabric, etc