If you really want to jump off the deep end, ncode.syosetu.com has the original web novels for a bunch of popular series.
For example, here’s 蜘蛛ですが、なにか？(So I’m a Spider, So What?)
Or 転生したらスライムだった件 (That Time I Got Reincarnated as a Slime)
The web novels lack some of the editing and polishing that happens when they get professionally published, but they’re still pretty good as is.