https://5thsrd.org/rules/multiclassing/You can multiclass in 5E (assuming Larian stays consistent with 5E on this point). There are stat requirements to multiclass into specific classes, but you can multiclass. Feats are selected in place of ability points at certain level thresholds.
Feats:
https://www.aidedd.org/dnd-filters/feats.phpThere are fewer feats than 3E, as 5E is all about 'streamlining', but they are there and some of them are quite good.
Namely, "Ritual Magic" is perhaps the most awesome one.
Yeah Ritual Caster is my favourite feat too, usually the first feat to get.
Go Wizard unless you are a Wizard or therd os a specific character idea in mind.Find Familiar by itself has been said to be a Class Feature in spell fork..making it worth it by itself and I'd say the same about Unseen Servant, Phantom Steed, and Tiny Hut! From Clerics Commune, Ceremony, and Walk on Water is awesome (bonus points for blending it water based cantrips), and the Druids Speak with Beasts abd Commune with Nature.
