Harry's POV
I was boarding the Hogwarts Express while thinking about the best vacation I had this summer. Last year I found out that my godfather was innocent and was unjustly thrown in Azkaban which is a Wizard's prison. I helped him escape with help of Hermione using the time turner she got to continue her classes. Which was absurd in its own way, I mean who would give out a device that can travel through time for attending more classes. At least Hermione was responsible with it.
After helping Sirius escape, I thought he was going to a different continent and would stay there for a while and that I would not hear from him this summer. But I guess I was wrong, He met me at Dursley's after a week to discuss the summer arrangements and to remind Dursleys to treat me well.
After that, we would meet at least a week to chat and he would tell me about my parents and we would have fun. Other times when Sirius is busy, I would meet Professor Lupin who would help me with my summer studies. He also told me to self-study Ancient Runes and Arithmancy after I was interested in the beads on Sirius' hands as I could not enrol in those classes now that I am a year behind my peers. I started learning Runes and Arithmancy from Remus (yeah, he told me to call him that though it still feels weird to call him that) with help of notes I got from Hermione. I was halfway through the third-year course in both subjects by the end of August. He also helped me with other subjects such as Potions and Transfiguration. I watched the duel between them once and I was awed by the magic they were using I was surprised to see Sirius winning the duel, I mean who wouldn't, that guy just got out of prison and was living in hiding. But his usage of Transfiguration inspires me to the subject even more when I learned that my dad was better at Transfiguration than him. I couldn't use my wand but I can learn basics and theory. So, I also started learning Transfiguration theory starting from the first year. Once I competed for the theory of the respective year, I would go to Grimmauld place for a day or two to practice spells there with a different wand which was not a perfect fit but was good enough. I managed to start the theory of the Fourth year till the end of my vacation. I also wanted to start dueling specially when I learned there reason for doing so. It seems that they knew Voldemort is alive and were preparing for it. I realized that Voldemort will be coming after me and being unprepared would not only hurt me but also my friends, so I wanted to prepare as much as I can but they told me they would teach me Dueling once i have completed books given to me by them which includes "Basics of magic", "Guide for fast Casting", and "101 spells for dueling". I guess I should include Hermione and Ron in this activity. I know Hermione was thrilled but I am not so sure about Ron.
I also remembered that weird dream when I was in a house with Pettigrew and they killed a person. The worst part was that my scar hurt which only happened when Voldemort is near. So I told Sirius about the dream, and in response, he sent a few books on meditation and mind magics. A few books were titled as
"Mind Magic Introduction"
"Step 1 Meditation"
"How to Access Your Mindscape"