if we can determine the price of support and resistance, we will be able to estimate when the coins will pump or dump.
If you are able to identify support and resistance levels then you can enter/exit in profitable way but you cannot do anything with pump or dump as those manipulations are being performed by whales who do not bother support and resistance things but technical people do adjust them by having resistance-1/mid-point-1/resistance-2/mid-point-2 etc.
For example, by April/May 2019 BTC prices rallied from $3800 levels to $13,500 levels without bothering any resistance levels in-between (currently we are bothering about $10k levels as a biggest one but it was broken very easily at that time). So, if you have followed your support resiatnce thing by that time then you might have booked profits at resistance-1 and someone might had not watched markets and had not put any target order, somehow got opportunity to book above $12,000 levels.
This is the reason, people do call trading is all about "probability".
If you are a trader and do not understand support and resistance, I make sure you often experience losses.
Not necessarily. Traders may set target without realizing about resistance levels and when more people do follow same kind of strategy, that target level becomes a strong resistance level. Same applies for support zone. When more people do buy out of their strategy, price will not fall further hence we do identify that prices as support levels.