Things I've noticed observing the crypto market:

The market usually follows a cycle of about 4 years. The year following Bitcoin's halving generally sees a new historical peak (2013, 2017, 2021, 2025), and the year after that comes a strong decline (2014, 2018, 2022, 2026). Over time, this cycle seems to be becoming less intense.

Almost the entire market revolves around Bitcoin: when it rises, most coins rise along with it. In bull markets, altcoins tend to rise more than BTC; in bear markets, Bitcoin falls less.

Trends exist, but the market spends most of its time moving sideways. Therefore, indicators that work well in trends need to be used with caution.

In a bull market, often it's better not to intervene and let it run.

In a bear market, oscillators that indicate oversold conditions tend to yield good results.

Some coins deviate from the pattern: TRX has little correlation with BTC and is less volatile than it. NEXO, despite being small cap, has lower volatility than SOL and XRP. Ethereum, on the other hand, fluctuates too much for a coin of its size.

Periods of calm usually come before significant movements. Very rapid rises are often followed by strong corrections.

When the main token of an ecosystem rises, the smaller ones tend to follow.

PAXG seems not to fall, but even it dropped sharply in 2022.

Coins that were successful in the last cycle may today be almost forgotten, like SUI, HBAR, and XLM.

Cardano seems "dead," but it still occasionally makes explosive highs, followed by larger declines.

Weekends tend to be more volatile, while Wednesdays have fewer reversals.

Coins with low volatility tend to have a slight upward bias in the long term.

Indicators that work in trends do not work well in sideways movement.