The orange valve is a gate valve -- they suck and corrode after time, making it almost impossible to work on the plumbing. I ALWAYS replace gate valves with ball valves because they are more durable and give you longer life. (see yellow handle in pic)
This video is very helpful for beginners, even though the guy is a goober and the video skills are amateur. Also, he puts the same crummy gate way valve when he could have done better.
If you can find someone to help you, take advantage . . . torch work is learned by doing and there are tricks to the feel of it. (HNT: Use the best flux you can find.) Also, I notice there is no faucet (hose bib is the right term) above your shutoff . . . that means you may get dripping from the house into your soldering area (bad).
Keep asking questions, get somebody to help, go for it!