Entries are always in the Demand Zones that I mark out. For my SL's, I personally am overly cautious and hence tend to keep my SL's just below the Demand Zone's. And then re-enter as per my levels if needed or pyramid into.
But technically, previous Swing Lows are the correct way to go (depending on whatever time frame is mentioned)
I don't like giving specifics but ranges, because its EOD candles that I only focus on. And even then, people jump in with FOMO. Hence, splitting the capital is always whats best and then averaging into the trade.
Hope this explanation helps.
Please feel free to ask me for any other clarification.