Main phase 1 ruling need help

[rajelmok]

By entering the main phase 1 and i still did nothing can may openent activate an effect or trap/spell ?

[MadRest]

At the start of Main Phase 1, you have the right to make the first move. Unless you pass this chance to your opponent, they aren't allowed to do anything, at the start of any phase.

[(RF) MnM General]

no you have priority, they cannot do anything until you do something

[TragiiK]

eg. Your main phase, you can set a s/t card or monster before the opponent can activate the effect of Psy-framelord omega