Can someone help me understand the verb

[sand wraith]

What about it confuses you exactly? Your question is a bit vague

[mint igloo]

Yeah my bad.

So for example,

How "I Send", "They Send", He/She sends and you send all have weird endings.

I suck at explaining stuff

[sand wraith]

I mean, it's the same as in English and with every other verb.
You can say "we send" and "he sends"
But you cannot say "we sends" and "he send"

Similarly, in French you have to use the correct form of a verb depending on who's doing the action.
You can say "nous envoyons" and "il envoie"
but you cannot say "nous envoie" and "il envoyons"

You can say "I am", "You are" and "He is", but you cannot say "I is", "You am" and "He are"

So this isn't a new concept to you, assuming you speak english

And if you want to see what the actual endings are, it's easy to look up on websites like leconjugueur:
https://leconjugueur.lefigaro.fr/php5/index.php?verbe=Envoyer

[mint igloo]

Envoyer is an irregular verb.

I have my answer now anyway 🙏