Well, in the 'solo leveling full novel', Sung Jin - woo starts off as an E - rank hunter, which is the lowest rank. But as he progresses with the help of his leveling system, he not only gets stronger physically but also gains new abilities. He has to deal with various types of monsters that come out of the dungeons. There are also political and power struggles within the hunter community. And as he levels up, he uncovers some secrets about the origin of the dungeons and the true nature of his power. He gradually becomes a key figure in the fight against the threats that the dungeons pose to the human world.
You can start from the chapter where the anime ended. Usually, there are online forums or manga communities that can give you the exact chapter number.
It's about a world where hunters fight against dangerous monsters. The main character starts off as a very weak hunter but gradually becomes extremely powerful through his unique leveling system. It's full of action, adventure and has really cool art in the graphic novel form.
The Solo Leveling anime sticks closely to the manga. But there are instances where the anime might condense or expand certain events to create a more engaging viewing experience. The key plot points and character developments remain largely unchanged, though.