As a beginner there's no harm in holding Bitcoin though , the Reason why most time newbies are literally advise to go into long-term holding is because is more easier to minimise your losesse when you are holding than when you are trading with your Bitcoin for short-term profits (short-term investments) , as long is bitcoin the chances of you selling in loss on long-term holding is low compared to short-term, but still you can still do what is beat for you but I still advice you have some portion of Bitcoin that you are holding for long-term while you trade , expecially at this time around every one is expecting Bitcoin to undergo a new breakthrough.
There are stages to things so no matter what it is when you are a beginner you must learn to follow through the stages and this is also applicable to Bitcoin investment. When investing in bitcoin it is always advisable that beginners should try to play it safe first until when they have experience enough to try out complex strategies. Long term investment is the safest investment for beginners because it carries less risk and there is no much work to be done the investor after buying the bitcoin abut in short term investment one needs to be knowledgeable about the market movement and know the right time to buy and sell. This will be more easier for a pro and not a beginner so to reduce the risk of losing money beginners should always play safe and not try to be smart.
The decision to make a short-term or long-term investment depends on your financial situation.
Not just your financial situation but also your preference. The one you are most comfortable with should be your decision.