Just keep playing

Hey I had the same question too, basically you can get xp from crafting badges with trading cards and also you can buy them with steam points but that's different, i recommend you to collect the trading cards that u need from a game asking a friend or just buying them from the market, and also to do the steam community badge, that one is a really good way to get some xp that im pretty sure will set you to level 5, lmk if u have any questions!

引用自 willi：

Im not new, new to steam but i'm still confused on the level system.

I know there badges, crafting gems, ect but Im not sure how to get them and the best ones to get.

How to level up your Steam account:

• Complete your community badge.
  
• Buy trading cards from the community market to craft badges.
  
• Get the "Seasonal Badge" from the points shop.

What does having Steam Levels give you?

• The maximum amount of friends is initially capped at 250 for accounts. For every Level gained, you will be able to have 5 more friend slots. This can expand to a maximum of 2000 total possible friends.
  
• For every 10 Levels gained, you will receive 1 Showcase slot. These can be used to display a unique Showcase on the Profile (achievements, videos, screenshots, etc.). This can expand to a maximum of 20 at this time but more may be added in the future. Note: if you have bought an extra Showcase on the Points Shop, that adds an extra Showcase slot on top of the maximum.

From: Steam Levels and XP (FAQ)

A higher Steam level also increases your chance of receiving a booster pack drop.