De or het manicureopleiding?

The correct Dutch article is:

de manicureopleiding

Rule Words ending in -ing: almost always de. See the rule

How to use manicureopleiding

the manicureopleidingde manicureopleiding
this manicureopleidingdeze manicureopleiding
that manicureopleidingdie manicureopleiding
our manicureopleidingonze manicureopleiding
your manicureopleidingjouw manicureopleiding
every manicureopleidingelke manicureopleiding
which manicureopleiding?welke manicureopleiding?
a big manicureopleiding / the big manicureopleidingeen grote manicureopleiding, de grote manicureopleiding