A vVery fFun Day A Very Fun Day

Or "A very fun day" - either is okay, but if you're going to capitalise Day you have to capitalise the other words too.

I had absolutely nothing to do, and neither did my online friend too. I had absolutely nothing to do, and neither did my online friend.

"nothing" makes this a negative sentence, so to agree with it you use "neither" instead of "too" or "so".

So we decided to call each other. So we decided to call each other.

I'm not sure if this was an error, but it sounds more natural to me like this.

We talked for a very long time about allnything and everything. We talked for a very long time about anything and everything.

But at the same time, we do have some things ion which our opinions differ. But at the same time, we do have some things on which our opinions differ.

I'm not sure if this is an error either, but this is how I'd say it.

So we sometimes discuss those matters and try to find a good meeting point tobetween both our opinions, which makes our conversations very interesting and fun. So we sometimes discuss those matters and try to find a good meeting point between both our opinions, which makes our conversations very interesting and fun.

I feel lucky to have found a good friend like her, and I'm lookindg forward to next Sunday because we agreed to talk again then. I feel lucky to have found a good friend like her, and I'm looking forward to next Sunday because we agreed to talk again then.