If you applied for a Student visa from a country that is outside the EU/EEA, you will receive an email/letter confirming the duration of your visa and a travel visa vignette in your passport that allows you to travel to the UK within the dates listed on the visa. When you arrive in the UK you will need to collect your BRP card (Biometric Residence Permit). You will need to collect this from the post office you selected on your visa application form.
If you are from the EU/EEA you will be issued with a digital visa, you will be able to sign in to the view and prove service to access your digital visa and prove your status to others by generating a share code.