r:r
Lots written on this in text books and educational/training material. Most of it is very similar, you must strive for 1:2, 1:3 is better, never accept 1:1 etc. Much of this originated in the US, mostly from the great stocks bull market that ran through the 80's and 90's. This was when trading reached the masses. But beware, there are unspoken assumptions in the words of wisdom -
1. calculated r:r came from stocks: maybe you trade in indices, forex or commodities so how applicable is it there?
2. the stocks studied were US stocks, nothing in the FTSE, certainly nothing in the Nifty 50 or Japan etc.: see above
3. most of the stocks were galloping, that's why they were interesting - so, tech stocks, IPO's, private investor fascination stocks, gold miners, oil well drillers etc. - we're not talking Severn Trent here
4. we're only talking going long - there was previously no mass market way of shorting US stocks, and who wanted to anyway?
5. one r:r rule applies to all trade/entry patterns, and also to long-term swing trades and also to 10 minute daytrades - why?
Occasionally, very very occasionally, you see a trader recommending 1:0.5 or 1:0.25 for a specific purpose. I'm not able to say what's right or wrong for every trade for every trader, but I can say there's room for debate and different approaches.
Okay, so you're talking about 1:2, 1:3 - but how do I achieve it? IPO stocks long-term, is that your point?