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I’m assuming you’re talking about the CFA Institute curriculum, since the only material from CFA Institute that is called ‘Handbook’ is the The Standards of Practice Handbook, which is useful only for Ethics.
There isn’t really a ‘best’ study method, as it differs from candidate to candidate. I can tell you that most candidates use third-party provider materials – some to support their learning from the official CFA Institute curriculum, but a lot of them use third-party materials exclusively.
A lot of candidates do find third-party materials beneficial, by making studying more exam-focused and efficient.
Here are some guides that may help you:
If you’re looking at third-party providers, just look at our Exam Materials page and options in our nav bar. Our Free Materials list is also a good place to start.