My code is working just fine but I want to insert two images side-to-side and it only shows me the first one.
This is my code:
<div align="left">
<img src="http://phdcomics.com/comics/archive/phd101212s.gif" width=300 height=400>
</div>
<div align="center">
<img src="http://phdcomics.com/comics/archive/phd052810s.gif" width=300 height=242>
</div>

Also the text in this slide is misaligned (centered) and the first bullet point has some extra space, that I can't get where is coming from. Here's the code:
# **Empezando**
El control de versiones es una categor铆a de software que realiza un seguimiento de los cambios en sus archivos por usted. Te permite:
- experimentar con c贸digo y funci贸n sin romper el proyecto principal 馃挏
- mantener todo el historial de un archivo e inspeccionar un archivo a lo largo de su vida 煤til
- etiqueta una versi贸n en particular para que puedas volver a ellas f谩cilmente
- facilita las colaboraciones y hace que las contribuciones sean transparentes
---
class: inverse

Thanks in advance!
This would be a great question for stack overflow since it is not a particular issue with xaringan but more your own code. If you put questions there then the answers will be easier to find and others can more readily benefit from them.
The indentation of the first bullet point is because all your lines are centered. To find the solution to that and the side-by-side images we need to see a full minimal working example that shows the problem. Why are you including the images as html? Try the include_graphics function - it may make it easier to tweak stuff later on.
What you want to do is something like this:
.pull-left[
<img src="http://phdcomics.com/comics/archive/phd101212s.gif" width=300 height=400>
]
.pull-right[
<img src="http://phdcomics.com/comics/archive/phd052810s.gif" width=300 height=242>
]
Most helpful comment
What you want to do is something like this: