In general…
You can dry chile peppers by hanging them on a string (just like the strings you see used as decorations). Use a large needle & strong thread. Run the thread through the chile stems, tie occasional knots to keep them spaced apart, when you get a good bunch on a string, either tie it off and add a loop for hanging, or tie them in a circle for hanging.
You can hang herbs to dry - tie them in small bunches by the stem end with thread/string and hang them up until dry.
You can also lay them out on a cookie sheet, wire rack, screen, or whatever else you have handy until they’re dry. Just keep them in a thin, single layer so they have plenty of air around them. They’ll dry faster on a rack or screen because they’ve got air all around.
You can do this will all kinds of herbs, the thicker ones just take longer to dry.
You can also freeze herbs rather than drying them. Lay them out on a sheet like you’re going to dry them, but put them in the freezer instead. Once they’re frozen, you can put them in a ziplock. This might work better if you strip the stems first - I haven’t messed with it much. We usually dry ours and store them still on the stem.
I assume that “sun-dried tomatoes” are the same thing as tomatoes dehydrated in the sun, just as you can do for any other fruit. Clean 'em up, slice 'em up fairly thin, put 'em on a screen in the sun and wait for 'em to dry. With tomatoes, I’d think you’d want to peel & seed them, or at least seed them. A cheesecloth or similar cover is good, to keep bugs off. You can use a dehydrator instead of sun - IME a dehydrator is faster. I’ve never done comparisons, so I don’t know if there’s any noticeable difference in taste.
We can’t get cilantro to grow, but I know that purchased dried cilantro is nasty.
I just recently tried roasted red peppers in oil - damn! I’d love to know how to make these yummy things.
Also “garlic oil”. I’ll have to look at it when I get home - it’s a locally made product that doesn’t seem to really have oil in it (low-cal, no-fat on the label) that’s incredibly yummy. It’s a worcestershire-shaped bottle with an asparagus stalk & garlic cloves floating in it.