If your colleague lost big money, he probably did what 90% of beginners do: threw everything into a single cryptocurrency and held it too long hoping for a bounce back. that's the real mistake, not the timing. volatility in 2026 has always been there and it'll keep being there, whether you invest now or a year from now.
the trick that basically nobody actually uses is this: if you really want to mess with crypto, only put in what you'd be willing to lose completely without it wrecking your life (lots of people say "5% of your portfolio" but that's just a guideline, it varies person to person). then instead of trying to guess when to sell, set up a gradual exit strategy: when the price goes up 50%, you take out 20% of what you own, when it goes up another 30%, you pull out another chunk. that way you at least lock in something concrete when your luck turns.
the second thing is stop thinking of bitcoin and ethereum as a single asset. they work slightly differently in market cycles. but honestly if you're already scared of volatility this isn't the type of investment for you, period. it's not criticism, it's just reality. there are less risky tools that still give decent returns over the medium to long term. the fact that they're less thrilling isn't a flaw.