Everyone is excited about their research and wants to share EVERYTHING about their topic(s). The goal of a poster is to catch the viewer's attention and get them to engage with the content. Editing down to the most essential information organized in a clear sequence can greatly increase the effectiveness of your poster.
The first example below is very visually crowded. The amount of text would likely be overwhelming to a reader and the organization of content is unclear and difficult to follow. An audience would probably have difficulty engaging with this poster.
The template example below has a good balance of content and negative space. The information is well organized into columns and is easy to follow.
Tip: To achieve clarity with your poster content, start with everything you want to say then "ruthlessly" cut out words and condense down to just the most essential elements.