Q1: What does "effects don't affect" mean, exactly?

This effect prevents a card from being affected by effects. For example, your Digimon won't suspend if it's chosen for a "suspend 1 of your opponent's Digimon" effect, and its DP won't be reduced by 3000 if it's chosen for a "1 of your opponent's Digimon gets -3000 DP" effect.

Q2: Can a card that has an "effects don't affect" effect be chosen for an effect?

Yes, it can be chosen. For example, a Digimon that isn't affected by effects can be chosen for a "suspend 1 of your opponent's Digimon" effect.

Q3: Can a card that has an "effects don't affect" effect be given an effect?

Yes, it can. It won't be affected by it, but it can be given an effect. However, if an effect such as Security Attack is given to a Digimon that isn't affected by effects, the Digimon won't be considered to have that effect.

Q4: If a card is affected by an effect, then it later gains an "effects don't affect" effect, what happens to the effect that was affecting it?

As soon as it gains the "effects don't affect" effect, it will no longer be affected.

Q5: If a card with an "effects don't affect" effect gains an effect then later loses the "effects don't affect" effect, what happens to the effect that it gained?

It will be affected by the gained effect as soon as it can be affected by effects.

Q6: A card that has an "effects don't affect" effect was given an effect that triggers at a timing such as When Attacking. Will the effect trigger if that card later meets the trigger conditions?

If the Digimon isn't affected by effects upon the trigger timing, the effect won't trigger.

Q7: What does "also" mean?

“Also” means that the effect given by that effect has the same duration and targets as that effect's previously resolved portion. For example, in the case of “Until the end of the turn, all of your XX Digimon gain AA. If you have a Tamer, they also gain BB,” all of your XX Digimon gain AA until the end of the turn, and if you have a Tamer, all of your XX Digimon also gain BB until the end of the turn as well.

Q8: I activate this card's End of Attack effect and digivolve it into BT20-056 Alphamon. At this time, is the "if during an attack" condition in BT20-056 Alphamon's On Play When Digivolving effect fulfilled?

Yes, it is. When the end of an attack occurs, it is still during that attack.

Q9: What does this card's inherited effect do, exactly?

This effect triggers and can be activated when a Digimon specified by it leaves the battle area under the specified conditions. When activated, all Digimon matching its trigger conditions are prevented from leaving.