Reactions are small emojis with a specific description to them. You will find them very useful to give your 'reaction' to a post should there be no reason for you to post a comment. It's a quick way of saying what you think of the posters message.
At the bottom right of each post you will find the first reaction - which is 'like' so if you like what the poster has messaged then click the first reaction. Or you can use any of the other reactions to state your opinion with a simple click.
This is what the reactions look like; the first image is to show you what they look like in there static state - the second image is an animation showing you the reactions available:
This is a very simple and easy way to voice your opinion of other members' messages; you cannot add a reaction to your own posts.
Any questions or problems use the comment box below to ask.