Is composer self-update is important ?

It's not required, but composer has updates as well. Think about security updates and improvements. Updating composer once in a while is not a bad thing to do ;)

the problem is i can't update from our hosting place (BLUEHOST) so i have to download the project then after the updating i have to upload thtz a issue im confuse its required or not @bobbybouwmann

You can run composer self-update on shared hosting? Well that is common thing. If you want to have composer updated you need to go to their support and ask them to update it. But like I said, it's not required. You can still run composer install for your project

I had some issues with BLUEHOST for laravel 5.1 min req php version 5.6 but their version 5.4 so i can change the version but when i chek via PUTTY its showing php version 5.2 i asked them to solve this issue but they also dosn't know they said ur PHP version has changed but via PUTTY they don't know how to change :( :( :( i checked from GOOGLE but i coudn't :( :(

That is the reason most developers have their own VPS so they can manage the php version. You can look at digitalocean for a cheap and good vps.

@bobbybouwmann its a small company and we have some websites also have to host (wordpress) so can i know the price?? and if we use digitaloean do we need to buy Forge also ?

You don't need to use Forge, but that means you need to setup your server by yourself. WordPress can run an any php server, so you don't have to worry about that. However using your own VPS gives you a lot of new challenges, so I advice you to talk with the support of Bluehost. If that doesn't work you can keep your WordPress sites at Bluehost and only use a VPS for the Laravel projects.

Thanks :)

Think of Forge as a control panel for your server. If you're confident in your Linux command line abilities, and have the time, then you can manage your server without Forge. On the other hand, if you're used to cPanel and the like, then Forge it probably a good options.

@nwebnz tnks buddy :)