"Helpful" means providing assistance, support, or aid to someone or something. It describes someone or something that is useful, beneficial, or willing to offer help. Full definition
Of course, having my mother as a taste tester is very very helpful in knowing if a recipe is a success. (beyondthebite4life.com)
Your instructions are really easy to follow and your video is also very helpful for if I have any doubts about how and why and when. (downshiftology.com)
Here are some basic principles you may find helpful in finding your own, custom diet. (neatstrength.com)