To expand on my comment a bit:
The general expectation on Stack Exchange is that the asker has done a bit of research into their topic before asking. Some questions can be answered with a simple search.
If the user tries but is unable to find useful information (maybe they used the wrong keywords so a page with the answer didn't show up) or would like additional clarification about something, then they can ask their question. It's helpful to include research in this step because it may allow people to also point out suggestions to help research future questions while they answer your question (such as "try including these keywords next time").
Now, if you have a follow-up question, that's fine. Just make sure to do a little research on that topic before opening a new question.
Q: Why is X conjugated like this?
A: Because of grammar rule Y (that you've never heard of before).
Before asking a follow-up question about Y, take a few minutes to look up the topic and familiarize yourself with the basics and you might even answer your own question. But, if you are still unclear about something, then go ahead and post your follow-up question about Y (and preferably mention your research or what you didn't understand in the results you found).
Now you have posted two questions. But, since you showed you were at least putting some effort into your questions, that's okay.
What I believe Tsuyoshi was talking about was the situation where you immediately ask "What is Y?" and the immediate answer is "Did you look it up?"
A good rule of thumb is to put as much effort into researching your question as someone would put into answering it for you.