There are many ways you could go about this...
There are many similar threads you can find in this section that will give you a plethora of ideas and tactics used to start earning some crypto.
If you do not have much to invest yet, start grinding for some capital. You can do this by either providing any services and getting jobs from people on the forum looking for people with any skills you may possess. You can find opportunities like that in the
Marketplace > Services section. If this doesn't interest you, start becoming more involved on the forum... log some hours, make more posts, and earn merit to incerease your rank on the site. That way you have a better opportunity to join a signature campaign that can slowly help you build enough capital to start investing.
From there you can start investing what you've earned, learn some tactics from the Trading section of the forum, and see if you can grow the money you've earned. That was my strategy at least...
Heres a good place to start, this site gives a good list and descriptions of the top trading sites you can use...
https://www.ubuntupit.com/best-cryptocurrency-exchange-platforms/If you've got powerful enough equipment, you could always look into mining...
If not, you could check out some long-term investment opportunities such as compound.finance...
Otherwise... best of luck to you, the forum is definitely the right place to get started, whether by posting questions or just reading, you can learn a lot.