Live within your means
Payoff any credit cards you may have.

Start saving for a house deposit OR decide to rent. In general the sooner you can get even a cheap place the better. If you rent then after awhile it can become more cost effective to continue renting.

Save 10% (at least) and first have money that is easy to access. Then a second pool of higher interest paying funds. In the short term do not invest more then 20% of your savings in stock.

Look at supplementing your stipend with work. First thing make sure it doesn't interfere with your studies. Second either get a job that is a substitution for the gym or one that enhances your job experience in line with your studies.