A little extra lubrication is often always a good idea and can make sex more comfortable and pleasurable. And no, lubricated condoms are never enough... in fact extra lube is recommended for use with thinner condoms (which invariably includes all modern condoms).
Note that there are two main types of lubricants for intimate/sexual use, water-based and silicone-based, and of course we've got both on offer. What's the difference?
Silicone-based lubricants are slicker and won't wash off easily, so they're excellent for use in and around water. They'll need soap and water to be removed, and this extends to your sheets. Note that some toys should not be used with silicone-based lubricants, so it's important to check.
Water-based lubricants are, as the name suggests, water-based with some additives. They're easily washed off, and so might require re-application, but they are generally safe for use with all condoms and toys.
You'll note that oil-based lubricants are notmentioned here for use as they should neverbe used with condoms as they can significantly increase the potentials for condom breakage. This includes baby oil and coconut oil.
Thereafter, there are different kinds of lubes as a result of what is added.
Arousal lubes add extra to mere lubrication, such as a tingling sensation,
Flavoured lubes are ... flavoured, which can be nice for oral sex,
Desensitising lubes can help to prolong sex and/or delay orgasm which can be particularly beneficial if you or your partner has issues with premature ejaculation.