Quite a lot of names for nodes have changed between Dynamo 063 and 070. If you would like to follow the tutorial videos closely that are posted now, it would probably be best to stick with 063. We plan to update the videos to reflect new names and functionality this summer. Before the current branch of Dynamo becomes the “official stable build,” we will do our best to publish a list of translations for node names. Until then, Dynamo 070 and the daily build qualify as the experimental branches, so you run the risk of using software that is out ahead of the documentation.
The other thing to note is that the Dynamo Development team has been working hard to make sure that Dynamo 063 files migrate as best as possible to Dynamo 070. Often, if you you want to see how the implementation of a new functionality has changed, make it in 063, then open it up in 070.
Unless there is something wrong with your installation, you shouldn’t have missing nodes, but the names may be different between versions. Try looking in the categories of the library where you would expect to find something, and you should generally find what you’re looking for.