Well, some manga creators or publishers might offer free chapters or special promotions on their official websites or social media. Keep an eye out for those. Also, some educational or cultural institutions might have legal access to manga for educational purposes.
Occasionally, there are promotions or giveaways on legal manga reading platforms where you can get free access for a certain period. But you have to be quick to catch those opportunities.
Occasionally, there are partnerships between manga platforms and certain events or campaigns that provide free legal reading. But it's not a common or consistent thing. You could also check out community-driven manga projects that are licensed for free distribution, but those can be harder to find.
Some manga websites offer free reading options with legal licenses. For example, Webtoons often has a variety of manga available. But make sure to check the site's terms and conditions to ensure it's legal.
Some manga publishers have their own official websites or apps where they provide free access to certain manga series. Keep an eye on those. Also, some educational platforms might have legal and free manga for educational purposes.