That is not a question that can be answered with a single keyword. It all depends on the niche you focus on. Is it gaming, DIYS or beauty tipps or whatever.
Think about your niche. Also think about the competition on the related topic. If you start a YT channel and go into minecraft, the competition is freaking high and your chances of getting ranked for minecraft is pretty low.
Research of your niche is the main key factor you have to focus on, in order to get ranked. Also the quality of your video matters a hell lot. You have to create videos, people wanna watch and eventually share with others. Otherwhise it is just another video which gets down to the YT dust.