I assume you are talking about grid trading in crypto, so yeah i am still testing it and to be frank i actually have most of my focus on it nowadays. At start it looked easy but once I get into it damn it just goes deep and deep. The strategies in it are very different which make sense(i mean it is different). But it can also backfire but what i feel is, the risk involved in it much less than doing like future trading like normally.
It do involves skills too not like those videos u might have seen where it will seems like magic and profts all the time, like it has its own strategies and most importantly there are so many options which can be very confusing.
Although one warning i will give is some services give u late stats like bot being profitable for 24 hours or something like that, most of them give the stats after bot runs for more than 24 hours which can be useless as most of the time, by the time you create your bot looking at that you are already pretty late.
Now i am involved in mostly future trading bot, i don't bother with spot trading bot, i mean i don't involve with spot trading in general anyway.
So in future there are mostly three type of bots long, short and neutral. Now long short are obvious they create grid in the single direction while neutral which create grid in both directions like buy orders on one side and sell on other. My recommendation is to stick to neutral grid and just test with little money.
The most important thing in it is volatility as when price fluctuate it works best, the ideal situation will be sideways market.
But like with everything in crypto it will seems easy at first but to make consistent good profits you have to test yourself.