Welcome to chess! I recently taught my 8-year old daughter as well. Its a great game and my best memories are of playing my grandfather when I was a kid
I'm one of those who think its not a good idea to let new players win because losing is part of the game- its what drives some of us to get better. Better to point out what they did well and let them feel challenged- builds good life skills and character. After all- did a more experienced coworker ever
let you get a promotion in his place
Here's site I found useful when teaching my daughter:
Duif's Guide for Chess Fans: Teaching Your Child Chess
The Exeter Chess Club has been one of my favorite sites for years. They have loads of stuff for players of all levels, and have it organized so you can design a
basic course of study to improve.
This page has some fun games that help develop some of the deeper ideas that you'll come across if you start to study the game even casually. Its not formatted the best.
To take full advantage of all the chess stuff out there and at the Exeter site, you'll need to learn (takes just a few minutes)
chess notation.
If all else fails, just play for fun
Questions can be put in the general forum most likely- as you gain knowledge you'll know if it fits better in a more specific forum.
en passant is a special pawn capture, so saying a Bishop moves diagonally is just fine. They're usually referred to as 'sitting on the diagonal'.