The money

The chain part is well solved. The part that goes wrong happens before any of it.

Why Monero for new accounts

Bitcoin transaction graphs are public and permanent, indexed by every analytics firm, with clustering that improves every year against data that never expires. A deposit made today can be linked to a funding exchange years later. You are not making a decision about current tooling, you are making one about every future version of it applied to a permanent record.

Monero inverts that. Ring signatures hide which input was spent, stealth addresses land each payment at a fresh one time destination, and confidential transactions hide the amount. A passive observer learns that a transaction happened and nothing else.

The procedure

Copy the subaddress from the deposit page. Do not retype it and do not reuse one from a previous session.
Paste into your wallet, enter the amount, leave the ring size at the default unless you specifically know what you are changing.
Broadcast. First confirmation in about two minutes.
Platform credit at about ten minutes. If nothing after twenty, check the transaction in your own wallet before contacting anybody.

A fresh subaddress each time is how a wallet separates incoming payments without linking them, which is most of the point. Reusing an old one defeats that and can credit the wrong place.

Where privacy actually leaks

The real exposureNot on the chain. At the boundary, when you convert from something with a record into something without one. A withdrawal from an exchange that knows you, followed four minutes later by a deposit of a matching amount, does most of the work for anybody looking.

Which means the coin choice is necessary and not sufficient. It protects the hop and does nothing about the exchange record, the bank transfer behind it, or the timing. People who understand the cryptography and skip this end up with excellent on chain privacy wrapped around an obvious trail.

Two rules about amounts

Fund what you intend to spend soon. A balance sitting on a platform is exposed to everything that can happen to a platform, and no escrow arrangement protects funds that are parked rather than committed to an order. This is the most common way people lose money on a platform that never did anything wrong to them.
One movement rather than several small ones. Each transfer pays a network fee and adds another timing event at the boundary.

Clipboard hijacking

Boring, real, and cheap to run. Malware watching for something address shaped and swapping it costs nothing and works often enough to be worth doing. Check the first and last several characters of what actually landed in the send field, every time. This is one of the few places where checking the ends is the right check, because you are catching a wholesale substitution rather than a near miss.