The Crypto dip of early 2018 is a gentle description of what could rather be described as a Crypto crash of early 2018. With the total marketcap falling by more than 50% many people ware hit hard and rightfully consider leaving this field entirely but behold: There is a universal solutions to cope with the recent events and to prepare yourself accordingly for future investments.
The most important rule is to not become greedy as an investor by lavishly investings in too many uncertain projects, hoping an initial low price will yield in super high returns. Look at cryptocurrencies, which you consider practical and understandable from use case point of view. By going in easy at first you have a very good chance by making the right decision and starting out with the right mindset of attemepting to undestand the product you put yout money into. This does not only give you safer returns but most importantly it prevents sleepless nights.
Secondly, while checking the marketcap, have a look at the total supply and circulating supply of a coin or a Token. A very high total supply, while having a low circulating supply may already indicated a stagnating or very low rising price in the future, especially if the total marketcap of that coin is already pretty hight (tens or hundreds of billions $).
And lastly: be up to date with the news. Things change pretty quickly in the crypto field. And if you are early and on par with the recent events you can save yourself a lot of stress and lot of money. Cryptocurrencies should be considered a long term invesment as they potentially result in the biggest yields (be prepared to hold for years), but as an asset you should be well-considered with your money and whats going on around it.
Oh, and last but not least: always keep your crypto in a private wallet, never leave them laying around in the exchanges!