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Hostels may not have things that hotels nearly always provide, such as towels, washcloths, WiFi, or toiletries. Make sure you pack anything you'll need that you can't rely on your hostel to provide. You'll be sharing a room with multiple people who might snore loudly or come back to the room very late at night. If this type of late-night activity is likely to wake you up, you'll need to have earplugs and a sleeping mask to be able to get a restful night's sleep in a hostel. Some hostels have more than 20 beds in the same room, so the odds of you sharing a room with someone who snores may be extremely high. In dormitory style hostels, the best accommodations offer personal lockers for stowing your valuables. Bring a combination lock that you can use to secure this locker when you go to put your belongings in it. A combination lock will be more reliable than a lock that requires a key, since you won't be out of luck if you lose the key! Hostels are typically located in the center of a city, which unfortunately means that some locations are in relatively sketchy or dangerous areas. When you check in, just ask the people at the front desk if they have any particular recommendations or suggestions on places to avoid or steps to take to stay safe. For example, ask if there are any parts of town that you should probably not venture into after dark.
Find out what amenities the hostel offers and pack accordingly. Bring earplugs and a sleeping mask if you're a light sleeper. Pack a lock if the hostel doesn't provide one for their lockers. Ask the staff about how to stay safe in the area.