/ starting outside
Most important piece of kit is google.co.uk
by very real climbers. There have been 100s of posts on here about gear, top roping, multipitch etc etc but much better if you search, read and then ask if you have specific questions, no one is going to reply when you haven't searched and read first.
Yeah, he's right I'm afraid. Asking questions like that suggest you know absolutely nothing, where to even start? Filling in your profile might actually be a good start.
You need an experienced climbing partner. That's it. They can then advise you on what you need based on what you plan to do together.
there are lots of "how to climbing" books that also list and show what is required...
How do you know he's not already a seasoned indoor climber that just wants to move outside? And can you be sure that the average indoor instructor will be able to give him very much advice about an environment that may be equally foreign to them?
Assuming you've got all the normal kit for climbing inside, you'll obviously need a rope, half-a-dozen screwgates, a few slings, and some nuts, cams, etc for setting anchors.
However, doing this on your own with no training or experience is a bit fraught, its easy to make a mistake and mistakes can be painful or fatal. I'd second taking a course at a local wall (loads of places do wall-to-rock" courses) or persuading a more experienced climber to take you out.
For the latter you'll need to fleash out your profile quite a bit, as people are understandably wary of trusting their life to someone who they know nothing about, so a full profile will help immeasurably.
Standard observation: if you're keen and committed and you've got basic seconding gear (harness, helmet and nut key) and you can belay a leader safely, your local climbing club should be happy to take you out.
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