Here are some tricks if you are new to crypto world.
For me i found it good to use 3 part trading trick.
1. Suppose you have total budget of 900$, first thing is do proper research before you invest. Once your research is done , buy coin of worth 300$....
2. Now look into market, if you think you are in profit then book your profit and wait for dip, but if you are in loss then wait some more time for more dip and pick some more coins.
3. now if you see market dip more and more, then wait and wait for best time and buy for further 300$. By this way you can balance your high purchase with low purchase because at some moment it will pump if you think you invest in good project.
So 3 part trading is best thing.
For me i found it good to use 3 part trading trick.
1. Suppose you have total budget of 900$, first thing is do proper research before you invest. Once your research is done , buy coin of worth 300$....
2. Now look into market, if you think you are in profit then book your profit and wait for dip, but if you are in loss then wait some more time for more dip and pick some more coins.
3. now if you see market dip more and more, then wait and wait for best time and buy for further 300$. By this way you can balance your high purchase with low purchase because at some moment it will pump if you think you invest in good project.
So 3 part trading is best thing.
Look at the case of Neo. Neo reached $160, imagine if someone used your strategy, the person would be with reasons to be panic and angry because the price of Neo in the current day is in the $7.
Buy High, Sell Higherer
Easy to say right? 
but when we already bought a coin it will go down. no higherer but in reality it is sell low . Maybe your theory will work when a coin get pumped, or maybe listed in new market.this reminds me in the past: when I bought a coin, hours later the price of the coin fell and I would panic and sell, days later or weeks later the coin would recover and rise. Dude, I got really angry