paypal link has been added

Author: Asabeneh

images/paypal_lg.png

@@ -61,9 +61,9 @@
 </div>
 
 <div>
-
-<small>Support [**Asabeneh**](https://www.patreon.com/asabeneh?fan_landing=true) to create more educational materials</small>  
-[<img src = './images/become_patreon.png' alt='become-asabeneh-patreon' title='click' />](https://www.patreon.com/asabeneh?fan_landing=true)
+<small>Support the **author** to create more educational materials</small>  
+<a href = "https://www.paypal.me/asabeneh"><img src='./images/paypal_lg.png' alt='Paypal Logo' style="width:10%"/></a>
+</div>
 
 </div>
 
@@ -583,7 +583,7 @@ Example of invalid variables:
   num_#_1
 ```
 
-Let us declare variables with different data types. To declare a variable, we need to use *let* or *const* keyword before the variable name. Following the variable name, we write an equal sign (assignment operator), and a value(assigned data).
+Let us declare variables with different data types. To declare a variable, we need to use _let_ or _const_ keyword before the variable name. Following the variable name, we write an equal sign (assignment operator), and a value(assigned data).
 
 ```js
 // Syntax