Nobody can say for sure whether ETH is worth for hodling or trading. So, you should decide it by yourself 'cause no one knows your strategy or financial position. Read Ethereum predictions like this one from BitDegree (https://www.bitdegree.org/tutorials/ethereum-price-prediction/#Ethereum_Predictions_2018). Then, choose the exchange where to buy and trade. I would like to suggest you CEX – you can easily buy ETH there using your cards or via bank transfers (https://cex.io/buy-ethereum).