For a great manga reading experience, you could try Viz Media or Comixology. They have licensed content and reliable servers. But remember, always respect copyright and choose legal platforms.
Goodreads is also a wonderful site for novel reading. Not only can you read many novels, but it also has a community where readers can discuss the books they've read, share reviews, and get recommendations from others. It enriches the reading experience.
FanFiction.net is also popular. It has been around for a long time and has a huge number of stories. There are different categories based on the type of media the fanfiction is related to, like movies, TV shows, books etc.
Some of the top sites to read novels are Google Books. It has a large repository of books, including many novels. You can preview and in some cases read the whole book for free. Smashwords is also a good one. It focuses on independent and self - published novels. There are a great number of free and paid novels available there. Barnes & Noble Nook is similar to Amazon Kindle, with a wide range of novels to choose from.
AO3 is completely free. It's run by a non - profit organization and is supported by donations. All the fanfictions on it are accessible without any cost.
Wattpad is a great free site. It has a huge community of writers and readers, so there are always new light novels to discover. Another free option is Webnovel. It offers a lot of free chapters for users to enjoy light novels without paying immediately. Royal Road also provides free access to a large number of light novels written by various authors.