Learn Russian: На мой взгляд, лучше подождать до весны. - In my view, it is better to wait until spring.

It is in the accusative case. The phrase literally translates to "onto my view" using the preposition на. Because взгляд is an inanimate masculine noun, its accusative form looks exactly like the nominative. This is a great alternative to по-моему when you want to sound slightly more formal, like "in my view" versus "in my opinion."

Why is there no subject like "it" before лучше?

Russian frequently uses impersonal constructions where English requires a dummy subject. Here, the comparative word лучше acts as the core of the sentence all on its own. You just pair it directly with the infinitive подождать to express "it is better to wait."

Why use the perfective verb подождать instead of the imperfective ждать?

You could actually use either, but they emphasize different things. The perfective подождать focuses on the successful completion of the action (waiting until the specific goal of spring is reached) and sounds like a concrete, contained piece of advice. The imperfective ждать would focus more on the prolonged process of waiting itself.

Why does the word for spring change to весны in this sentence?

The preposition до, which means "until" or "up to" in this context, always requires the genitive case. Therefore, the feminine noun весна drops its final -а and takes the genitive ending -ы.