Push new lwc
sfdx force:source:deploy -p path/to/component.js-meta.xml
example:
sfdx force:source:deploy -p force-app/main/default/lwc/dominic3/dominic3.js-meta.xml
Push new Apex
sfdx force:source:deploy -p path/to/MyApex.cls-meta.xml
example:
sfdx force:source:deploy -p force-app/main/default/classes/TestAccount.cls-meta.xml
New LWC:
sfdx force:lightning:component:create --type lwc -n myLightningWebComponent
Start Locale Dev:
sfdx force:lightning:lwc:start