When using linkedin you see a list of suggested accounts that you can follow. Similarly they keep feeding you with very relevant posts that are most likely to be interesting to you. All this is enabled by linkedin ranking. This is the way linkedin analyses the posts made on their platform to know what each and every post is all about. This way linkedin can tell that your account is about certain topics and can promote your account to people who like such content.. To do this linkedin has a very well build algorithm that takes into consideration so many things.
What goes on mostly on linkedin is images posting and other text related content. This text type of content is very easy for the non-human algorithm to understand. In lame language you can say that the algorithm reads the posts. This way it can easily understand what the post is all about. For the video and image posts the algorithm can depend on the text accompanying the post Like the tittle. Therefore make sure that the text is relevant and straight to the point. The algorithm also depends on the peoples interractions with the post.
User engagement with your posts, the more the likes and endorsements that the viewers make for your posts the more algorithm loves your posts. Your linkedin account authority, if your account has existed for long and has been making posts about that particular topic and getting many likes and endorsements, then linkedin is more likely to favor your account for that topic than a new account that was started yesterday and made a post.