Confused about Proficiency

[Velovar]

Hello can someone answer few questions about Proficiency please
I understand that selecting Proficiency that goes with my character (charisma based) is a safe play.
But... at the top of Skills tab, where it says Proficiency Bonus - Inherited Skills; I have read that these Proficiency (inherited ones) level up as we level up.
So it ok to select Arcana (sage background) even tho its Intelligence because it will level up to basically our "Skills with Proficiency" which in turn will rise as my Charisma rises.
I hope I made myself clear a bit hard to put it into words as English is not my native :)

[Yojo0o]

You have a proficiency bonus that scales modestly with your total character level. Anything you choose to be proficient with as part of your character build will gain that bonus. It's fine to choose a skill that you don't have a high corresponding ability score with, such as Arcana on a character that doesn't have a high intelligence, but you won't be quite as good with the skill as somebody who is both proficient and has a high corresponding ability score.

[Pan Darius Cassandra]

Your proficiency bonus increases with character levrl. It starts at +2. It applies to everything you are proficient in, including weapon attacks.

When you make a skill check you add your proficiency bonus and ability bonus to your die roll. If you are proficient in a skill, but the relevant ability score is lower, you will simply have a smaller bonus (or in some cases, a penalty). If you attempt something for which you are not proficient, then you only get your ability bonus.

[Shale]

Your Proficiency Bonus is a set bonus that applies to any skills, saves or attack rolls your make that you're proficient in (the bonus has no affect on armour, despite using the same term).
At levels 1-4 this is a +2 bonus. At levels 5-8 it will increase to +3, and levels 9-12 it will increase again to +4.

It's a question of if you'd rather min-max your character into super charisma, or spread yourself thinner, not being quite so amazing at your main stat's skills, but having a better chance to succeed in arcarna (or whatever else).
If you're considering Gale on your team I'd suggest letting him carry the arcane knowledge and focus in those charisma skills. If not then it's down to your personal preference and what you value.

[WeenerTuck813]

You have a standard “Proficiency Bonus” that goes up as you level. Same for every class.

It starts at +2

The way it works is, ANYTHING, be it skills, weapons, etc, gets +2 if you’re proficient with it.

If you’re proficient with long swords, they get +2 to attack from proficiency. If you’re not, you can still use long swords you just don’t get +2.

If you’re proficient with arcana, you get +2 on Arcana checks.

[seandeven]

Keep in mind, bards and rogues can eventually apply expertise the additive bonus.

[.Master Jiren, The Strongest]

Theres 2 strategies

1) min max. This basically means you will put proficiency on to any skill that is your highest stat, usually your casting stat, so that you can basically never fail those checks.

2) roleplay. this is if you want to play a specific character but the proficiencies are not optimal, like a wisdom caster putting proficiency on history or arcana.

you have many party members with their own proficiencies so you dont have to be proficient in everything, you can pick things that your party members do not have.