To obtain VK likes without any cost, you can engage with other users by liking and commenting on their posts, as this often encourages them to reciprocate. You can also join VK communities and share your content there to reach a larger audience. Additionally, collaborating with other VK users or running contests and giveaways can help increase your likes. Lastly, consistently posting high-quality content that resonates with your audience is key to gaining more likes on VK.