LdrLoadDll Stub - This is similar to the Standard injection technique except it goes 1 level deeper into LoadLibrary. LdrpLoadDll Stub - This goes even another level deeper into LdrLoadDll. It may crash or cause errors on OSes newer than Windows 10 as it can change. Thread Hijacking - This is a pretty stable method of injection that takes over already executing code to inject your DLL and is not used by many injectors. Manual Map - This is the most secure injection technique.
So secure that even Windows won't even know about the injected DLL.