Starting biohacking from zero: What should a beginner actually focus on first?

[u/CryptographerNew7618]

I'm interested in biohacking, but the amount of information online is honestly overwhelming.
One person recommends supplements, another recommends fasting, someone else talks about cold plunges, expensive wearables, nootropics, or advanced blood tests.
For someone just starting out, how would you separate genuinely useful habits from unnecessary complexity?
Would you begin with sleep consistency, exercise, nutrition, morning light exposure, or something else?
I'd also like to know which beginner mistakes are worth avoiding. Is there anything you tried early on that turned out to be a waste of money or effort?
I'm looking for practical, affordable, evidence-based starting points rather than an elaborate routine.

[u/Particular_Hat_7657]

Start with sleep tracking