There are several options. Some people use sites like MangaPark or MangaReader. However, make sure you're accessing them legally to avoid any potential issues.
I wouldn't recommend looking for free sources as it's illegal and unethical. It's best to support the creators by purchasing or subscribing through legitimate channels.
Reading Berserk manga for free from unauthorized sources is illegal and not recommended. You might try looking at some library services or official digital platforms that offer limited free access or trials.
Berserk is highly regarded in the manga world, but whether it's the 'best' is subjective. It has a dark and intense plot that appeals to many, but not everyone might agree it takes the top spot. Different people look for different things in a manga.
At the moment, there's no definite information on whether Berserk manga will continue. It might, but it could also remain unfinished. A lot depends on the circumstances and decisions of those involved in its production.