Convert Cursors to Set-Based

Question

I need some help. I need to convert this code with cursors to set-based operations. I can't understand how I can make the set-based code do the same as with cursors.

DECLARE Cursor static local FOR SELECT Cid,Abrev FROM EntityType OPEN Cur FETCH NEXT FROM Cur INTO @entityType, @entityTypeAbrev WHILE @@FETCH_STATUS = 0 BEGIN

SET @CurEnt = Cursor static local FOR
SELECT did FROM Entity where EntityTypeCid=@entityType
OPEN @CurEnt
FETCH NEXT FROM @CurEnt INTO @entityId
    WHILE @@FETCH_STATUS = 0
    BEGIN

        SET @RandNumber= FLOOR(RAND()*(28-1)+1);
    
        select @entityNumber=EntityNumber from Entity 
        where did=@entityId
        --print @entityNumber

        SET @FullName= @entityTypeAbrev + ' ' + cast(@entityNumber as nvarchar)
        SET @ShortName = @FullName 
        /* 
        * ENTITY*/
    
        UPDATE entity set fullname=@FullName, ShortName=@ShortName where did=@entityId
    
        UPDATE Agenda set EntityName= @FullName where EntityDid=@entityId 

--Intervetions SET @CurIntervs = Cursor static local FOR select did, CredOperIntervType from CredOperInterv where EntityDid=@entityId OPEN @CurIntervs FETCH NEXT FROM @CurIntervs INTO @credOperIntervDid, @credOperIntervTypeId WHILE @@FETCH_STATUS = 0 BEGIN

I need to have the same results that I obtain with cursors but with set-based operations