Create variables

How to Write Variables and what are the best practices to write the variables in shell scripting.

variables

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+#!/bin/bash
+#Purpose: What is variable.? How is help us in writing shell scripts
+#Version:1.0
+#Created Date: Sat May 5 20:25:21 IST 2018
+#Modified Date:
+#website: https://arkit.co.in
+#Author: Ankam Ravi Kumar
+# START #
+A=10
+Ba=23
+BA=45
+HOSTNAME=$(hostname)
+DATE=`date`
+1value=333
+False@Var=False
+Hyphen_a=WrongValue
+
+echo "Variable A Value: $A"
+echo "Variable Ba Vaule: $Ba"
+echo "Variable BA Vaule: $BA"
+echo "Variable HOST value: $HOSTNAME"
+echo "Variable DATE value: $DATE"
+echo "Wrong Variable 1value $1value"
+echo 'False @ Variable' $False@Var
+echo "hyphen-a Variable Value: $Hyphen_a"
+
+# END #