How can users add reactions to messages in Slack?

In Slack, users can easily add reactions to messages by clicking the "Add reaction" button, which is typically represented by a small smiley face icon located next to the message. This action opens a menu of available emojis that users can scroll through and select from. This feature allows for quick and easy feedback or acknowledgment of messages without cluttering the conversation with text responses.

Choosing this method enhances communication by allowing users to express emotions or sentiments succinctly using visual symbols. The use of emojis as reactions helps to convey feelings more vividly than text alone, making it a popular feature within collaborative environments like Slack.

The other options presented are less effective for adding reactions. Typing a response in the message box does not provide a reaction; it creates a new message. Right-clicking a message may offer other options but does not directly facilitate adding a reaction. Lastly, while keyboard shortcuts can be useful for various functions in Slack, they are not the exclusive method for adding reactions, as the visual button interface is the primary and most user-friendly way to engage with messages.