Hi guys im new here, currently lvl 13. Just confuse on some things and hope someone would help me

1. Which stat on equipment are you focusing on? The on that gives more int, or more hp? Im kinda confuse especially when equipping necklace and rings.

2. High dex equip should be ignored right?

3. What does the additional effect of equipments mean? Like the dark pact or the one that adds 25 int and something? How will i know if it took effect.

4. Currently my skills are, time shift (4, no dodge), fire (3 no scorch), lightning (no discharge, 4) , heal (1).. I think the damage with it is fine, what should i pit next,,

I appreciate any help thanks.