Threats to cryptocurriencies

Crypto is decentralized making it volatile market. No one owns it though everyone owns it.
The main concern could be like is it safe?
Are there any rules?
Is the investment safe?
Shall it remain decentralized currency?
What are the Dos and Don'ts?

One-liner replies to the question are as under

It is safe till your passwords, wallets are not disclosed.
There are rules that are set by different exchanges that include fee, transfer, connectivity etc.
It is a risky investment but with high promising profits.
It seems not to remain decentralized for a longer time period as governments have started to bring this to tax net.

Dos
Invest only that amount which you can afford to lose.
Be patient.
Read about the market and relevant news of the coins.
Pay attention to the minute information such as roadmap, white paper, issuance, exchanges acceptances

Don'ts
Don't decide hurry
The coin with high supply shall always have low-price. The developer shall dump their coins when price starts to rise.
Use many exchanges to avoid or skip transfer fees.
Don't invest by getting loan on heavy interest. There are chances that market shall show negative results for longer period of time