The app requires a purchase, user then receives a URL for installation.

I'm trying to figure out how much the app costs? Any information about that?

https://www.salesforce.com/products/platform/solutions/data-security/backup-restore-data-recovery/

• Given a scenario, identify the capabilities and implications of the sales process. (for example: sales process, opportunity, path, and forecast impact.)

component.set('v.columns', [
            //  {label: 'Id', fieldName: 'Id', type: 'text' , editable: true, hidden: true},
            {label: 'First Name', fieldName: 'FirstName', type: 'text', editable: true},
            {label: 'Last Name', fieldName: 'LastName', type: 'text', editable: true},
            {label: 'Email', fieldName: 'Email', type: 'email', editable: true},
            {label: 'Phone', fieldName: 'Phone', type: 'phone', editable: true},
        ]);

Fee__c

((YEAR(EndDate__c) - YEAR(StartDate__c ))*12) + (MONTH(EndDate__c) - MONTH(StartDate__c ))

(Fee__c / ((YEAR(EndDate__c) - YEAR(StartDate__c ))*12) + (MONTH(EndDate__c) - MONTH(StartDate__c )))

@isTest
public class UpdateAccountNameTest {
    @isTest
    public static void test1(){
        Profile prfl = [Select Id, Name from Profile where name ='System Administrator'];
        
        Account acc = new Account();
        acc.Name = 'test';
        insert acc;
        
        Custom_Object1__c a = new Custom_Object1__c();
        a.Name = 'testAccount';
        insert a;
        
        User usr2 = new User();
        usr2.LastName = 'setup1';
        usr2.Username = 'test1@test123.net';
        usr2.Email = 'tes1t@test123.net';
        usr2.Alias = 'Test1';
        usr2.CommunityNickname = 'Test1';
        usr2.TimeZoneSidKey = 'Europe/Prague';
        usr2.LocaleSidKey = 'cs_CZ';
        usr2.EmailEncodingKey = 'UTF-8';
        usr2.ProfileId = prfl.Id;
        usr2.LanguageLocaleKey = 'en_US';
        usr2.IsActive = true;
        insert usr2;     
    }
}

1. Using Test.loadData - although Salesforce provided us with information about setting custom value of LastModifiedDate, this does not seem to work even when following the tutorial. Link: https://help.salesforce.com/articleView?id=000332070&type=1&mode=1 (https://help.salesforce.com/articleView?id=000332070&type=1&mode=1)
2. Using JSON.deserialize - also does not work - copied the sample code and tried the same method, it shows errors. Link: https://help.salesforce.com/articleView?id=000332070&type=1&mode=1 (https://help.salesforce.com/articleView?id=000332070&type=1&mode=1)
3. Setting CratedDate through Test.setCreatedDate(recordId, createdDatetime) method - I hoped the LastModifiedBy field would have changed with it, it does not.

Product2 pro;
            if ((pro = (Product2)Tools.findRecordByValue(pros, 'Id', rec.Product2Id)) != null) {
... some code here
}

(Product2)Tools.findRecordByValue

trigger AggregateOrderAmount on Order (after insert, before update, after delete, after undelete) {
    Set<ID> setID = new Set<ID>();
    List<Account> lstAcc = new List<Account>();
    double val;
    for(integer i = 0; i<Trigger.New.Size(); i++){
        val = (trigger.new[i].TotalAmount - trigger.old[i].TotalAmount);
    }
    
    if(trigger.isinsert || trigger.isundelete){
        for(order o : trigger.new){
            setID.add(o.AccountId);
        }
    }
    else if(trigger.isDelete){
        for(order o : trigger.old){
            setID.add(o.AccountId);
        }
    }
    
    else if(trigger.isUpdate){
         for(order o : trigger.new){
            if(o.AccountId != null){
                if(trigger.oldmap.get(o.id).AccountId != o.AccountId){
                    setID.add(o.AccountId);     
                }
            } 
            setID.add(trigger.oldmap.get(o.id).AccountId);
         }
    }
    if(setid.size() > 0){
        lstAcc = [Select id,Order_Sum__c, val1__c, val2__c,(Select id,TotalAmount from Orders) from Account where id IN : setID];
    }
    for(Account acc : lstAcc){
        for(Order ord : acc.Orders){
            val += ord.TotalAmount;
                       
             for(integer i = 0; i<Trigger.New.Size(); i++){
            acc.val1__c = trigger.new[i].TotalAmount;
            acc.val2__c = trigger.old[i].TotalAmount;
    }                                        
        }
        acc.Order_Sum__c = val;
    }
    update lstAcc;
}