As far as my understanding goes, you can show ties with family, wife, fiance, you can even mention friends or bussinesses, properties. Some ties can also be a job that you have to return to, education you have to continue. You can mention you have the true intetion to return because... but do NOT try to hard to convince the officer, just mention it as it is something natural...
You can attach pictures, credentials, job certificates, etc
Hope this helps!
Regards.