Sample Code:

Component:

<aura:component implements="force:appHostable" >
    <lightning:card>
        <lightning:recordEditForm aura:id="recordEditForm" objectApiName="Lead" onsubmit="{!c.handleSubmit}" onsuccess="{!c.handleSuccess}">
            <lightning:messages />
            <lightning:inputField aura:id="field" fieldName="FirstName" />
            <lightning:inputField aura:id="field" fieldName="LastName" />
            <lightning:inputField aura:id="field" fieldName="Email" />
            <lightning:inputField aura:id="field" fieldName="Phone" />
            <lightning:inputField aura:id="field" fieldName="Company" />
            <lightning:button aura:id="myButton" variant="brand" label="Create Lead" type="submit"/>
            <lightning:button aura:id="myButton" variant="brand" label="Reset" onclick="{!c.handleReset}"/>
        </lightning:recordEditForm>
    </lightning:card>
</aura:component>

JavaScript Controller:

({
    
    handleSubmit: function ( component, event, helper ) {
        
        console.log( 'Inside Submit' );
        event.preventDefault();
        const fields = event.getParam( 'fields' );
        console.log( 'Fields are ' + JSON.stringify( fields ) );
        component.find( 'recordEditForm' ).submit( fields );
        
    }, 
    
    handleReset: function ( component, event, helper ) {
        
        component.find( 'field' ).forEach( function( f ) {
            f.reset();
        });
        
    }, 
    
    handleSuccess: function ( component, event, helper ) {
        
        let record = event.getParams();
        console.log( 'Created Lead is ' + JSON.stringify( record ) );
        console.log( 'Record Id is : ', record.response.id );
        let showToast = $A.get( "e.force:showToast" );
        showToast.setParams( {
            title : 'Lead Creation',
            message : 'Lead Submitted Sucessfully.' ,
            type : 'success',
            mode : 'sticky'
        } );
        showToast.fire();
    }
    
})

Output: