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Joining a society. These are great ways of meeting lots of people and making some new friends. It's also just a good way of making sure you get out and do something you enjoy. Most universities will have lots of different options so have a look and see if there are any you think you would enjoy doing.
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Have a look on social media as there will often be groups here that you can join and connect with people from your uni. On Facebook there will often be groups for different universities so have a look here and see if you can meet anybody this way!
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If you don't want to join a uni society, have a look and see if there are any other clubs in the area that you live in. There will quite often be clubs that you can join such as different sports teams! This might be a way to meet some people away from your uni.
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Try and talk to some new people in your lectures/seminars. This is a good way of meeting some new people so it might be worth trying to speak to someone new each time you go to uni and see if you can start any conversations with people this way.
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Try and see if your flatmates (if you live in halls) want to do anything with you. They may be up for going clubbing, or just having a games night or something!