It depends on your language skills and familiarity with the genre. If you're not used to reading web novels or if English (assuming it's translated) isn't your first language, it might be a bit challenging at first. But if you like the story concept, it can be very engaging.
I'm not entirely sure as I haven't read it specifically. But generally, a web novel about a 'hero of the shield' might be about a protagonist who uses a shield in heroic deeds. It could involve battles, quests, and the hero's journey while relying on the shield as a key element, whether for defense or in some unique combat strategies.
The Shield Hero manga and web novel have some differences in pacing. In the manga, the story might be more condensed, while the web novel can go into more detailed descriptions and slower plot developments. Also, the art in the manga gives a visual representation that might be different from how readers想象 the characters and scenes in the web novel.