I wouldn't recommend looking for free sources to read manga as it's illegal and against copyright laws. You can support the creators by subscribing to legal platforms.
You can try some popular manga reading websites like MangaDex or Mangakakalot. But be aware that not all content on these sites might be legal or of good quality.
Well, there are several options. Some people find Blue Lock manga on dedicated manga websites like Webtoon or Comixology. Sometimes, local libraries or bookstores might have it too.
You might be able to find it on some specialized manga websites or platforms that offer multilingual versions. But be careful to make sure they are legal sources.