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InfluxDB
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If you'd rather avoid exchanges, then first you'll need to get a wallet. The official wallet made by the IOTA project is Trinity, so I recommend that. You can then use services like ChangeNOW to buy IOTA with a credit or debit card, and they'll send the IOTA directly to your wallet address.
Last of all, consider using a portfolio tracker like Unspent, Koinly or CoinStats so you can keep an eye on things without constantly logging in to anything that can transfer coins, along with a password manager so that you never have to even type the password (which is good for beating keyloggers). Better safe than sorry!