Is posting a lot of videos help your channel to grow? i heard about that if you post a lot of videos you will have better chances to get more audience so is it true?
It depends on the quality of the videos and the size of the target audience. If you post 150 clickable, searchable videos that help people solve a problem, or provide an answer to a burning question, or satisfies some want or desire, all keyword optimized, entertaining and able to capture and hold people's attention, then, yes, you will have a better chance of building an audience.
Absolutely Quality, Target, volume in that order IMHOIt depends on the quality of the videos and the size of the target audience. If you post 150 clickable, searchable videos that help people solve a problem, or provide an answer to a burning question, or satisfies some want or desire, all keyword optimized, entertaining and able to capture and hold people's attention, then, yes, you will have a better chance of building an audience.