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The position property specifies the type of positioning method used for an element (static, relative, absolute, fixed, or sticky).
CSS Syntax : position: static|absolute|fixed|relative|sticky|initial|inherit;

Property Values
1. static : Default value. Elements render in order, as they appear in the document flow 
2. absolute : The element is positioned relative to its first positioned (not static) ancestor element 
3. fixed : The element is positioned relative to the browser window 
4. relative : The element is positioned relative to its normal position, so "left:20px" adds 20 pixels to the element's LEFT position 
5. sticky : The element is positioned based on the user's scroll position. A sticky element toggles between relative and fixed, depending on the scroll position. It is positioned relative until a given offset position is met in the viewport - then it "sticks" in place (like position:fixed).
6. initial : Sets this property to its default value. Read about initial 
7. inherit : Inherits this property from its parent element.

The Display property in CSS defines how the components(div, hyperlink, heading, etc) are going to be placed on the web page. As the name suggests, this property is used to define the display of the different parts of a web page. 
Syntax: display: value;

Property values 
Value Description
inline It is used to displays an element as an inline element.
block It is used to displays an element as a block element
contents It is used to disappear the container.
flex It is used to display an element as a block-level flex container.
grid It is used to display an element as a block-level grid container.
inline-block It is used to display an element as an inline-level block container.
inline-flex It is used to display an element as an inline-level flex container.
inline-grid It is used to display an element as an inline-level grid container.
inline-table It is used to display an inline-level table
list-item It is used to display all the elements in element.
run-in It is used to display an element inline or block level, depending on the context.
table It is used to set the behavior as for all elements.
table-caption It is used to set the behavior as for all elements.
table-column-group It is used to set the behavior as for all elements.
table-header-group It is used to set the behavior as for all elements.
table-footer-group It is used to set the behavior as for all elements.
table-row-group It is used to set the behavior as for all elements.
table-cell It is used to set the behavior as for all elements.
table-column It is used to set the behavior as for all elements.
table-row It is used to set the behavior as for all elements.
none It is used to remove the element.
initial It is used to set the default value.
inherit It is used to inherit the property from it’s parents’ elements.

The useEffect Hook allows you to perform side effects in your components.
Some examples of side effects are: fetching data, directly updating the DOM, and timers.
useEffect accepts two arguments. The second argument is optional.
useEffect(, )