You seem to be saying that you think those things are not relevant to your situation and that you have no reason to look into what they are and why they exist.
I think this is a mistake.
They exist to protect the future of your work!
Have you decided that you will accept the current version of ERPNext and never, ever upgrade to a later version? If so, then you are correct you can ignore all those things.
On the other hand, if you continue as you are going and you do decide, or someone after you decides, to upgrade, then all the work you have done will be overwritten and lost!
I have written an explanation of the procedure to manage customizations properly. Please have a look. Feel free to ask questions:
When you define a section of code, you can specify the coding language by using, for example:
```javascript
So this …
function UpdatePartyType (curr_d, curr_frm)
{
if(curr_d.payment_type == 'Receive')
{
curr_d.party_type = 'Customer';
curr_frm.refresh_field("party_type");
}
else if (curr_d.payment_type == 'Pay')
{
curr_d.party_type = 'Supplier';
curr_frm.refresh_field("party_type");
}
}
… becomes this …
function UpdatePartyType (curr_d, curr_frm)
{
if(curr_d.payment_type == 'Receive')
{
curr_d.party_type = 'Customer';
curr_frm.refresh_field("party_type");
}
else if (curr_d.payment_type == 'Pay')
{
curr_d.party_type = 'Supplier';
curr_frm.refresh_field("party_type");
}
}