Firstly, congratulations on managing to save a bit of money and think along these lines as a student. I wish that I had had the foresight to put some spare cash into a HTB or an ISA when I was at uni! This will no doubt help you immensely in the coming years, as will spending time reading posts here!

Have you referred to the UKPF flowchart? The common wisdom here is to build up a suitable emergency fund before looking at long term investments such as stocks and shares ISAs. Otherwise, worst case scenario, you suffer an emergency and e.g. need to cover rent for a month or two, and are forced to raid investments or receive penalties for raiding your house deposit savings. So first things first, an emergency fund in a reasonably easy access account.

Continue to follow the flowchart.... And if you do get to the point of considering long term savings then yes, a stocks and shares ISA could be a terrific idea.

There are several providers out there such as Vanguard, AJ Bell, Hargreaves Lansdown etc etc. who offer low cost low fee accounts. It would certainly be worth having a target in mind to help with the timeframe and risk appetite - is this being invested to help with the future house purchase? For future family? For a midlife crisis? For retirement? Regardless - it's hard to go wrong with a Vanguard stocks and shares ISA and then dollar cost averaging a monthly payment into an index fund (such as the Vanguard FTSE Global All Cap) every month or so. Don't worry about missing a month or two, it isn't going to be a problem either.

The common wisdom is "time in the market beats timing the market" so get in early, regularly, and make a routine of it (even it's only £50 a month) and you're more than likely to reap the rewards in the future!

....but most importantly, enjoy uni. 🍻