An approach

Hello fellow investors! I am a long term investor and I've been planning to try Trading. I will put a ton of effort into learning before I jump in, but I have a few questions. I want to specifically target stocks that have high swings, but they must also be fundamentally strong. I have a decent amount of working capital. So, in case of an adverse movement, I could retain the stock as it is fundamentally strong and settle the contract with my working capital. Then, once the stock goes up, I could sell. This might be too vague, but I just want to understand if this is a good approach, or if this is already a common practice in the market. Cheers!