I keep a pretty meticulous spreadsheet for this because I'm always reading three or four ongoing webnovels at once. The landscape changes fast, but the core hubs are pretty stable. For official, legal updates, I prioritize sites like Webnovel and Royal Road. Webnovel has a huge catalogue, but their free daily pass system is a grind—you get two passes a day to unlock chapters, which is fine if you're patient. Royal Road is almost entirely free, user-driven, and the update alerts are super reliable; most authors post schedules right on their fiction page.
A lot of people sleep on the official publisher sites for translated light novels. Yen Press and J-Novel Club often put the first volume or several chapters of a new series up for free as a preview. It's not daily updates, but for catching the start of something new legally, it's a solid move. The quality is guaranteed, and you're supporting the official release.
For less mainstream stuff, I lurk on Scribble Hub and Novel Updates. Novel Updates is an aggregator, not a host, but it's the single best tracker for fan translations of Asian webnovels. It indexes update dates and links to the translation sites, which are often independent WordPress blogs. The downside is that these can vanish overnight, so you have to be ready to jump ship. My current obsession, 'Lord of the Mysteries', I found through there, and I've been chasing updates across three different fan sites in the last year alone.