While Vem only supports programming language agnostic features by default, you can configure it to provide support for any programming language using Vim's multiple extensibility options. There are two major ways of doing this:
Using language servers: language servers are external processes that are able to understand your programming language and provide the editor with information about how to perform certain actions. They are one-stop solution as they typically support most of the language specific features once they are configured to be used. Language servers have been popularized by Visual Code as a way of sharing language specific insights between different editors.
Using plugins: while a language server is usually integrated into the editor using a plugin, there's also the possibility of installing independent plugins for each feature. The advantage of this approach is that you have more control on which features you enable and also on which specific plugins you want to use.
Which one should you use depends on several factors, for example there are more complete/better language servers for some languages than for others, and you also may want to have a lighter configuration for your editor than a heavier one. In general, if you're looking for a more IDE/full-featured experience and there are good language servers for your programming language, then using them may be the best option. If you want to keep the editor small and just need a couple of features to make your editing more comfortable, you may then opt for just adding one or two plugins to cover those cases. In any case, there's no restriction on combining both if that fits your needs.
A word of caution
Plugins for language specific features may look very appealing but be wary —like with any other kind of plugin— of installing plenty of them upfront. There are cases where they are genuinely convenient and solve a real need, however, installing them indiscriminately can lead to slowing down the system and the appearance of unwanted side effects. The standard actions of the editor, while pretty simple in nature, are surprisingly good at covering most editing needs. So, as a general rule, you may want to double check if you really need a plugin before installing it and to opt to have less plugins that you actually use than plenty of them that you don't.