Please enter the Swedish language! Questions related to Swedish pronunciation

1. Why did each letter (b,c,d, etc.) not sound crisp, but had a small ending sound at the end? (It sounds like a small "ah" or "I", which is very relaxed but not obvious.) Is this a pronunciation pattern, a habit or something? 2. What was the pronunciation of the long e? Was it the sound of the letter A with the mouth closed and sliding like an American accent, or was it the long sound of the German e with the mouth pressed and fixed? Why did he hear the word "substitute" when he heard the word "te"(like the last syllable in question 1)? 3. Short e: I saw an explanation saying that the pronunciation of the word "net" was like English, but when I heard the word "nej", I felt that the mouth shape was very small and close to the English letter "a". What should it be like? 4. Why was it that although the K at the end of the word was light, it felt different from the English light K? When the mouth shape was closed, it sounded like the silent letter K (like the silent kay in English okay or the silent ki in English kid)? 5. K is in front of a soft syllable, such as k rlék. What is the main point of pronunciation? I suspect that it's not the 'x' sound of the Hanyu Pinyin, but the 'ch' sound of the German? Similar to the ch in kílo , check, kj in kjol… 6. Some people say that the pronunciation of a long o (such as stol) is like the oo sound in the English word tool. Is that true? 7. Is it enough to shorten the long note above? 8. The pronunciation of the short u? Like under 9. Why do I always feel that't 'sounds like'd' when I hear some words like 'vínter'? Just like the water in the American accent? Did I hear wrongly, or is that what happened? 10. The pronunciation of 'y' in the word 'dyr'? 11. The pronunciation of the long sound in Kra? Someone said it sounded like the u in English fur, but I couldn't hear it clearly after listening for a long time. 12. The p in hjlpa, skjörta sounds like a b. Did I hear it wrong? 13. The 'ch' in 'chock' sounds like the 'sh' in 'shoe'. What's the difference between the two? Please! Self-taught. I haven't bought the teaching materials yet. Please explain in detail! Please! the fourth question I heard the sound of the ending 'k' like the sound of the English letter 'k' in a whisper, but it seemed that the mouth shape was smaller and flattened...