Holding of coin involve you keep a coin in your wallet till it get to a price you feel you will want to sell it and then make profit and this holding can take months or years to get to a price you want, we all know that cryptocurrency is very volatile and also very risky and when one is taking about holding it should be a good coin well trusted coin so you won't hold that coin in vain, there are some coin you will hold for years and it will fall in value and price and will never rise again that is why when you want to hold coin you need to choose a good coin for example Bitcoin.
Bitcoin is the first crypto coin to be created and one of the best investment right now in the world and also the best crypto coin in the world Bitcoin has made a lot of people rich and has also helped in growing the economy of the world, Bitcoin is the best crypto coin when you talk about holding because you have nothing to fear it won't fall in price even when it falls is just an opportunity to accumulate more Bitcoin because it will certainly increase in price again i will advise you to go through the history of Bitcoin and see for yourself.
Then when you talk about trading one needs to learn it very well in other to succeed in trading and trading is the most risky cryptocurrency investment strategy, it involves you predicting if a coin will increase in price, when you get it right you make profit but when you get it wrong you lose your money, because is your money you are using to predict and if you are not careful you will lose all your money, i know someone that lost a lot of money in trading and he even borrowed money just to continue his trading, I'm not saying people always lose in trading there are people that make money from it also but is more risky than holding.
So anyone one you feel is okay for you then you can go with it and if you later discover you are not okay with it then you can leave it and go for the other.