text: yaar,mujhe samajh nahi aata ki aakhir crypto exchanges kaise kaam karte hain, kya yeh sirf trading platforms hain ya aur bhi kuch hai?exchanges toh trading ke liye hote hain, lekin inhe use karne se pehle samajh le ki fees aur security features kya hain, kyunki kuch exchanges trustworthy nahi hote!