Since there's no spot metering on the 400d, I think the closest you can do is zoom in and partial meter
This is an exposure 101 question - most texts on basic photography will have a section on exposure, there are also books written on exposure - it is an old topic from film days. Look it up at your local library- it is impractical to retype out whole chucks of texts to satisfy your curosity.
Also be clearer as to what is it that your subject in the photo - you did not say what it is everyone has to guess what it coud be. We could guess right or be wrong then advice given on wrong basis is as good as wasting our time.
Thanks to all for informative posts in this thread.
if there is anything to add or to correct, let me know.
i'll do HDR, specifically, if it's landscapes concerend.
i.e, have a tripod, take shots that's -2ev, -1ev, 0ev, +1ev, +2ev.
then use the photoshop HDR merge function, do abit of tweaking in the inbuilt utility.
OK, think I more or less get the idea.
Really appreciate all the helpful tips.
Any bros out there with more tips to offer do continue to post them in this thread.