The basic trading method for using support and resistance is to buy near support in uptrends or the parts of ranges or chart patterns where prices are moving up and to sell/sell short near resistance in downtrends or the parts of ranges and chart patterns where prices are moving down.

It helps to isolate a longer-term trend, even when trading a range or chart pattern. The trend provides guidance on the direction to trade in. For example, if the trend is down but then a range develops, preference should be given to short-selling at range resistance instead of buying at range support. The downtrend lets us know that going short has a better probability of producing a profit than buying. If the trend is up and then a triangle pattern develops, favor buying near support of the triangle pattern.

Buying near support or selling near resistance can pay off, but there is no assurance that the support or resistance will hold. Therefore, consider waiting for some confirmation that the market is still respecting that area.
If buying near support, wait for a consolidation in the support area and then buy when the price breaks above the high of that small consolidation area. When the price makes a move like that, it lets us know the price is still respecting the support area and that the price is starting to move higher off of support. The same concept applies to selling at resistance. Wait for a consolidation near the resistance area, then enter a short trade when the price drops below the low of the small consolidation.
When buying, place a stop loss several cents (or ticks or pips) below support, and when shorting, place a stop loss several cents, ticks, or pips above resistance.
If you’re waiting for a consolidation, place a stop loss a couple cents, ticks, or pips below the consolidation when buying. When selling, the stop loss goes a couple cents, ticks, or pips above the consolidation.
When entering a trade, have a target price in mind for a profitable exit. If buying near support, consider exiting just before the price reaches a strong resistance level. If shorting at resistance, exit just before the price reaches strong support. You can also exit at minor support and resistance levels. For example, if you’re buying at support in a rising trend channel, consider selling at the top of the channel.
In some cases, you may be able to extract more profit if you let a breakout occur, instead of selling at minor support/resistance. For example, if you’re buying near triangle support within a larger uptrend, you may wish to hold the trade until it breaks through triangle resistance and continues with the uptrend.
There is also a concept that old support can become new resistance or vice versa. This isn’t always the case but does tend to work well in very specific conditions, such as a second chance breakout.