I think because cryptocurrency is so volatile that you'll be fine. Limit is the way to go, when buying market you can end up paying quite a bit more than you expected. Though the downside with limit orders is if the price never touches your limit price you can potentially miss out on getting in. I highly recommend checking out investopedia chart patterns if you're going to continue trading. Although at first it will all look like malarky eventually you'll start seeing patterns on charts and that can help you out a lot. Keep it up man! Good luck out there!