Asking About Repentance - A Humble Question

Salam everyone, I know this might seem like a basic question, but please bear with me. Back when I was younger, I wasn't the most committed Muslim, though I did try. That was before I became overly attached to my phone and started distancing myself from Islam and other meaningful aspects of life-basically, isolating myself. Lately, I've been working on strengthening my Deen, but due to that past neglect, I've had many questions about things I forgot or never learned properly. How do you repent? This is something I've been wanting to ask for a while. Recently, I've struggled with a haram addiction and have been striving to better myself as much as possible. Every time I watch Islamic content or search for ways to overcome this, I see the word 'repent' mentioned. So, how do you actually go about repenting in Islam?