Whats the safest way to chat on freenode [closed]

The easiest way to hide your IP from other Freenode users is to use a cloak. To get one, register with NickServ and ask for one in the #freenode channel, as described in the FAQ.

You can ask for an unaffiliated cloak in #freenode. This is our standard
cloak and normally shows unaffiliated/youraccountname. You will need a
registered nickserv account. Remember to verify your email address. Some of our
registered groups offer their own cloaks for their projects. To obtain one of
these, you need to find the group contact for the group you are interested in,
and ask them to arrange the cloak for you.

Cloaks are not the safest solution though. A safer solution is to use TOR, as described here:

The primary Tor hidden service address for freenode is p4fsi4ockecnea7l.onion.
The service listens on ports 6667, 6697 (SSL), 7000 (SSL), and 7070 (SSL).
To connect, a NickServ account is needed, and the IRC client must be configured
to support SASL

Client-specific instructions for setting up SASL can be found here.

The best way is to use Tor and SASL. There are ways to find the IP of a connected user, even if using the unaffiliated cloak.