Trading without loss is possible to some point, and this requires large volume of capital investment. Here the focus should be over a specific asset. Only then it is possible to observe the market. A very minimal profit margin needs to be set for selling, and same is with buying. As the market is volatile we've got more chances of the trade getting executed in a short time period generating small profit.
No matter how much capital do you have, trading is never risk-free. There is no full-proof strategy that ensures only profit.
Yeah, it is possible to limit the risk by putting right Stop loss. Also, the favourable risk-reward ratio also helps to trade with minimal loss. Trading is a skill which has many aspects. Probability of winning is also one of the major aspects. Trading with a good risk-reward ratio will help to be in profit always in spite of having poor winning ratio.
Eg: If you trade with 1:3 risk-reward ratio, and you have poor wining ratio 3:7(you win only 3 times out 10 and lose 7 times). Then also you can earn profits. because you earn 3*3=9 and lose 7*1=7.
So some strategies like this can help you to be in profit but again Trading is never risk-free.