Actually it depends on few of things. To be hired you will need to be better, than other junior devs, and without experience hr`s won`t even read your CV. So start from basics, then try to implement some pet-projects, to attach them to you CV to show what are you able to create.Them, maybe, you will get hired
To start learning try to find some free courses or paid once, read some books on your topic, try to solve algorithms every day (codewars, leetcode) to polish your knowledge
That`s all that I can suggest, good luck