now as for lingo: a full set means getting a whole nail put on (tips).. a fill in is just filling in the area from where the 'tip' grew out
there's also forever french, which is what i have.
the acrylic (or gel) is usually a pink color.. the forever french is white. so my nail tech builds my nails.. she doesn't use plastic tips. (a lot healthier for your nail) she uses the white to build the end then fills in the rest with pink.
attaching a pic of my nails- i do need a fill in and some lotion lol