Well, the Solo Leveling manhwa is based on a novel in the first place. If you want to experience the story in the novel format, you can try to find the official translated versions. There are various online platforms and some physical bookshops where you might be able to get it. Just keep in mind that the manhwa and the novel might have some minor differences in terms of pacing and the way some scenes are presented, but overall, it's the same great story.
They fill in the gaps. There are many parts in the main story that left us wondering about certain characters or events. The side stories answer those questions, making the overall narrative more complete.
It depends on your reading level and familiarity with the genre. If you're used to reading light novels, it may not be difficult. The language is usually accessible and the story - telling is engaging.
For some readers, it's not difficult at all. The plot of Solo Leveling is engaging and the writing style is straightforward. However, if you're new to web novels or not into the fantasy and action genre, it might take some time to get used to the pacing and the world - building concepts.
There are also some official websites of the publisher or the author that might provide the option to read the 'Solo Leveling' novel. However, make sure to access only legal and authorized sources to support the creators and avoid any copyright issues.
There are several options. Some people find it on dedicated comic websites. Another possibility is to check out apps specifically designed for comic reading. But make sure to use legal and authorized sources.