Hello,

I am brand new to Apex.

I am getting the following error: Error: Compile Error: Expression cannot be a statement at line 47 column 7
o.Dynamic_Dates_TB__c is of type Checbox.

This is the code I wrote. What am I doing wrong?

trigger TBAutoClientInitiation on Opportunity (before update) 
{
public static Boolean IsWeekendDay(Date dateParam)
   {
      boolean result     = false;
      system.debug('dateParam = '+dateParam); 
      //Recover the day of the week
      Date startOfWeek   = dateParam.toStartOfWeek();
      system.debug('startOfWeek = '+startOfWeek);
      Integer dayOfWeek  = dateParam.day() - startOfWeek.day();
      system.debug('dayOfWeek = '+dayOfWeek);   
      result = dayOfWeek == 0 || dayOfWeek == 6 ? true : false;
      system.debug('result = '+result); 
      return result;
   } 
   
public static Date AddBusinessDays(Date StartDate, integer BusinessDaysToAdd )
 {
      //Add or decrease in BusinessDaysToAdd days
      Date finalDate;
      if(StartDate != null )
       {
         finalDate = StartDate;
          system.debug('finaldate = '+finalDate);
          integer direction = BusinessDaysToAdd < 0 ? -1 : 1;
          system.debug('direction = '+direction);
             while(BusinessDaysToAdd != 0)
            {
                finalDate = finalDate.AddDays(direction);
               system.debug('BusinessDaysToAdd = '+BusinessDaysToAdd);           
                 system.debug('finaldate = '+finalDate);
                if (!isWeekendDay(finalDate))
                {
                    BusinessDaysToAdd -= direction;
                    
               }
           }
        }  
       return finalDate;
  }
   {
  for(Opportunity o : Trigger.new)
    {
   
    if(o.Dynamic_Dates_TB__c==True)
     {
      o.TB_Kickoff_Call_w_Client_ED__c == AddBusinessDays(o.TB_Kickoff_Call_w_Client_SD__c,1);
      o.Data_Req_Start_Date__c == AddBusinessDays( o.TB_Kickoff_Call_w_Client_ED__c,18);
      }
     } 
    } 
}