You can start all over again

[DAMKAR]

  I has invested in crypto with high value when I buy it.
for now I hold my coun and wait the bull run will come.

I think You start all over again.

[Dynamite]

That is why research the project before participating matters a lot than just joining without observing what kind of ICO/tokens you invested. Whitepaper is a must to determine their future of course your understanding means because you put your money to what you think good for you. Once disappointed you have choices to start all over again in other altcoins or to leave the market.

[Ed1973]

As advised I am trying to learn the basics of crypto first.

Most of the suggestions mention investing in top ranked coins. My question is, does it always work? As far as I understand, the market is vulnerable and affects almost all the coins from top to bottom. How then you determine which ones would stay ?

The idea of the project! I've known from the start crypto is going to be a long-term investment for me.  So, I hodl some MGO, CAT, MTK and other tokens. I know it will bring some satoshi soon. 

[trauchot]

You can study the market and check altcoins which interests you, you can see how they fell and grew over a certain period of time and draw conclusions.