What are the ways to promote in the social. networks you use?

Question

SMM

Good afternoon! Until recently, based on the projects I worked on, I got the impression that SMM is not the most effective, but rather one of the most ineffective ways of promotion. Perhaps the specifics of the projects and poor knowledge in this matter affected. Now there is a project that really has a great potential for promotion through social networks (vk, fb, inst, tw). Before starting to work closely with this channel, many articles were read and many informational videos were watched, but as usual, how many people, so many opinions. I want to appeal to those who actively use this particular traffic channel with a question, or rather two:
1. What methods of promotion in social networks do you use?
2. Which tool works best for you? Perhaps someone can even share life hacks.
Thank you in advance for your help!