I wash them on gentle cycle and air dry.
Then, iron that sucka like it owes me money.

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slacks = trousers = dress pants (not fully though) all generally have a crease with them and are generally made of wool (cotton/linen/etc exist) imo, dress pants are sold seperately, whereas trousers are a part of a suit. chinos are pants that are cotton, twill weave More on reddit.com

Usually wool, with a crease down the middle of the legs. I wouldn't let them be wrinkled either. More on reddit.com

I will mostly address question 2. I feel like I have seen an evolution of dress pants in the last ten years or so, and there are many more shapes now than there used to be. Here they are from widest to narrowest with a description of how they should fit, and my personal opinions about them. Pleated pants have additional volume and should pretty much be loose everywhere. The ones with wide legs all the way down can look a bit overwhelming but can also be styled beautifully . Pleated pants that taper at the ankle often have a PJ feel , so I would avoid them in business-professional environments. Palazzo pants fit tightly in the waist and butt, but then flare out ALL THE WAY. These are big pants, and are mostly casual . They can be dressed up and can even be appropriate for biz-cas if they’re not too voluminous. "Classic" slacks are fitted at the waist, butt, and hips, and then go straight down from the upper thighs. These were the typical, business-professional style a decade ago. I find them extremely comfortable . They are often made with some stretch , so they’re great in the plane for business trips. They can look a bit frumpy sometimes. Bootcut pants should be fitted from the waist through the thighs, then gently flare out starting right around the knees. They are no longer as popular as they once were, but I still like 'em . These flare nicely. These are very bell-bottom-y and a bit too reminiscent of the 70's for my personal taste. Straight leg pants are fitted from the waist to the knee, and then they go straight down instead of flaring out. It seems that these have replaced the old classic slacks (which used to be known as straight leg pants) as the dominant professional style. I think they look awkward cropped at the ankle , so I like the full length variety . Skinny pants are fitted all the way down, although sometimes there’s a bit of wiggle room in the bottom half. They are very popular right now and great for business casual work environments. Plus, I think they’ve quite versatile – dress ‘em up or down. In my opinion, these are the only pants which look good cropped . Feel free to add more styles! These were just off the top of my head. More on reddit.com