When investing in the stock market, yes you can specialize in one sector but you should be into other sectors as well. If you only buy into stocks that involve with the hotel, if something happens to that sector then you may lose money. When the virus hit in march of 2020, it really hit hard in the hotel sector and most people stayed home. The hotel industry got hit hard and they layed people off during this time. Right now they are building back up but you never want to just invest or specialize in one sector.
If something happens to that industry, you may lost some money. It’s a good that to have some other sectors to invest in have different types of stocks and different types of industries to invest in. Please do your own research before buying any stocks on the stock market. Try your best to have different sector in your stocks. I am not a stock expert so please do your own research