Welcome_App.app

<aura:application extends="force:slds">
   
    <aura:attribute name="enableRegistrationForm" type="Boolean" default="false"></aura:attribute>
	<aura:attribute name="buttonLabel" type="String" default="Open Registration Form"></aura:attribute>   
    
    <c:Registration_Component/>

</aura:application>

Registration_Component.cmp

<aura:component controller="RegistrationFormController" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
    <aura:attribute type="string" name="abc" default="true"/>
    <aura:attribute type="string" name="nameOfStudent" default=""/>
    <aura:attribute type="string" name="parentsName" default=""/>
    <aura:attribute type="string" name="standardOrClass" default=""/>
    <aura:attribute type="string[]" name="numberOfHoursStudy" 
                    default="Less than 1 hour, In between 1 to 4 hours, In between 4 to hours,More than 8 hours"/>
    <aura:attribute type="String" name="userResponse1" default=""/>
    <aura:attribute type="Integer" name="mobileNumber" default=""/>
    <aura:attribute type="Boolean" name="isAvailable" default="false"/>
    <aura:attribute type="Boolean" name="AreYouIntrestedInOnlineCourse" default="false"/>
    <aura:attribute type="Boolean" name="checkBoxValue" default="false"/>
    <aura:attribute type="String" name="PageHeading" default="Registration form for Student"/>
    <aura:attribute type="List" name="addEducationDetailsList" default="[]"/>
    <aura:attribute type="Registration_Form__c" name="RegForm"  default="{'sobjectType':'Registration_Form__c'}"/>
    

    
   <!-- {!v.abc}-->
    <div class="slds-page-header">
    <div class="slds-align_absolute-center">
        <div class="slds-text-heading_large ">
        	{!v.PageHeading}
        </div> 
    </div>
    </div><br/>
    
    <div class="slds-size_1-of-3">
    <lightning:input type="text" name="studentName" label="Enter Your Name" value="{!v.RegForm.Name}"/><br/>
    <lightning:input type="text" name="parentName" label="Enter your Father Name" value="{!v.RegForm.Parent_Name__c}"/><br/>
    <lightning:input type="text" name="currentClass" label="Enter your current Standard" value="{!v.RegForm.Current_Class__c}"/><br/>
    <lightning:select name="NoFStudyHours" label="How many hours you are studing in a day?" value="{!v.RegForm.Study_Hours__c}">
       <!-- <option value="green">1</option>
        <option value="red">2</option>
        <option value="blue">3</option>-->
		<aura:iteration items="{!v.numberOfHoursStudy}" var="hrs">
            <option value="{!hrs}" text="{!hrs}"/>
        </aura:iteration>      
    </lightning:select><br/>
    <lightning:input type="number" name="phoneNumber" label="Enter Your Mobile Number" value="{!v.RegForm.Mobile_Number__c}"/><br/>
    
    <lightning:button variant="brand" label="Add Education Details" onclick="{!c.addEducationDeatils}" iconName="utility:add"/><br/>    
    <aura:iteration items="{!v.addEducationDetailsList}" var="item" indexVar="index">
    	<c:Education_Details addEducationDetailsChild = "{!v.addEducationDetailsList}" indexRef="{!index}"/>      
    </aura:iteration> 
        
    <lightning:input type="checkbox" name="userAvailable" label="Are you available to the class?" value="{!v.isAvailable}"/>	
    <br/>  
    <lightning:input aura:id="checkbox" type="checkbox" name="onlineCourseIntrest" label="Are you intrested in online course?" onchange="{!c.callCheckbox}"/><br/>
        <aura:if isTrue="{!v.checkBoxValue}">
            Happy learning!!:)<br/>
        </aura:if>
        
    <lightning:button label="Submit" class="slds-button slds-button_brand" onclick="{!c.doSubmit}"/>
    </div>
        
</aura:component>

doSubmit : function(component, event, helper) {
		/***var intabc = component.get("v.abc");
        if(intabc == "true"){
            alert('Value is True');
        	component.set("v.abc","false");
        }else{
           alert('Value is false');
           component.set("v.abc","true"); 
        }****/
        var regForm = component.get("v.RegForm");
        var action = component.get("c.saveRegistrationFormDetails");
        action.setParams({regForm : regForm});
       
        // Create a callback that is executed after 
        // the server-side action returns
        action.setCallback(this, function(response) {
            var state = response.getState();
            if (state === "SUCCESS") {
                // Alert the user with the value returned 
                // from the server
                alert("From server: " + response.getReturnValue());

                // You would typically fire a event here to trigger 
                // client-side notification that the server-side 
                // action is complete
            }
            else if (state === "INCOMPLETE") {
                // do something
            }
            else if (state === "ERROR") {
                var errors = response.getError();
                if (errors) {
                    if (errors[0] && errors[0].message) {
                        console.log("Error message: " + 
                                 errors[0].message);
                    }
                } else {
                    console.log("Unknown error");
                }
            }
        });
    	 $A.enqueueAction(action);
	},

Apexclass : RegistrationFormController 

public class RegistrationFormController {

   @AuraEnabled
    public static Id saveRegistrationFormDetails(Registration_form__c regForm){
    
    
        insert regForm;
        
    return regForm.id;
    }
     
}