1. buy coin during ICO, IEO or STO;
It doesn't matter, better to focus regarding the project it is.
2. buy when the price down (dump);
4. buy when the price starts to increase (pump);
This method wouldn't work since you're only use your luck to buy the coin.
3. buy when the project has a good news;
5. buy when coin from the project listed on big exchange;
6. buy when the project already has a product.
This is FOMO, don't get tricked by this kind news. Most of time you'll ended up in loss since the FOMO is over.