When you created a list and you will see your List Name with a "Title" field which will be created automatically.

1. Add Field(s)

Click the "+" near "Title", you can add more field(s) per required and you can see a right pop-up windows.

Define the field type firstly which can not change to other properties(e.g. A text box can be changed to a textarea, but can not be changed to a number/currency...)

Each field type has its own properties and you can define it according to your business. You can edit its properties at anytime later.

• "Unique Value" means that duplicated value is not allowed if it's ON.
• "Placeholder" will be displayed when it's blank.
• "Multiple" means you can add one and more values in this field. 
• "Required" means that it will be mandatory to fulfill if it's on the form.
• "Add to Index" is important and a must to turn on if this field will be a conditional basis. 

2. Edit Field(s)

Normally we have 2 functions to take a quick edit as below:

2.1 Single Edit   You will have a quick edit from the drop-down arrow of each field.  You can edit the current one and also add one more field at its left/right.
2.2 Multiple Hide or Show   You may build a large of fields and some field(s) may not to be shown. Click "Hide fields" to manage its view.  When the mouse move on the field name and you will see the position action at right. Drag and drop it to up or down and change its order.

2.3 Full View and Edit

Still you want to see the whole field list, click the more action button (on right top) and go to "Fields" . You will be directed to "Fields Management" and where you can see all fields listed and click the more action button on the right to check or manage the existing field(s).