Saying the word "sana" and "durood" before reciting sana and durood in salaah

Q:

1. Zaid said the word sana before reciting the complete subhanakalluhamma wabihamdika... in salah, is the salah valid?

2. Zaid said the word Durood Ebrahim before reciting the whole Durood Ebrahim in salah, is the salah valid?

3. Zaid said the word dua before reciting the whole dua in salah, is the salah valid?

Forex trading

Q: Is Forex Trading without margin halaal? I mean, if I invest $500 and I trade from this $500 and don't take any loan, will it be permissible? How can I get physical possession on an online platform?