how to grow an Instagram account easily. i am new and tell me which apps i will follow to grow my account
Jarvee has everything you need to grow your IG account. There are follow tool and unfollow tool if you want to use the follow/unfollow strategy. You can use contact tool and comment tool if you want to grow your account with the mother/slave method. I can’t list all other cool features Jarvee has here. Just sign up for free trial to test the software yourself. 
https://jarvee.com/get-now/
how easy depends usually on how much you’re willing to spend. ‘usually’ if you have a big budget, it becomes much easier… if you don’t… then that’s gonna be harder… as days go by… growing on IG is getting more expensive
so i guess we’re missing the budget you have… to answer the ‘easy’ part
If you have a serious budget, i’d go with either Mass DMs or M/S. If not, then i can recommend manual f/uf
You should be using Jarvee for growth it has way too many options and tools, there are a lot of methods that can help you with that, f/U and main to slave accounts are the best, also, you need to be well aware of the restriction and IG limits these days there are changes every day, so you should be using the safest and good setups to avoid blocks and bans.
You’ve got two options, either to manually grow it or to use automation. If you decide to go for automation, I agree with other guys here, currently the best software on the market is Jarvee, without and doubt.