TAYSTUDIO operation notes · tool guides · tech/career · useful posts
What Google sandbox is, why a fresh domain vanishes from search, why CTR drops, and how AI Overview eats traffic — 12 SEO concepts from a month on a new site.
You don't need Lighthouse to diagnose page speed — curl -w gives TTFB and total time, sips reads image bytes, and Python sums per-page weight in a CI script.
From hypothesis-testing intuition to the test statistic, null and alternative hypotheses, p-value, significance level, and critical value, via one example.
![[AWS] NAT Gateway How-To & Setup Guide — Private Subnet Internet & Cost Optimization](assets/posts/aws-nat-gateway-guide/cover.webp)
A NAT Gateway gives Private Subnet EC2s secure outbound internet — step-by-step creation, EIP attach, routing, plus cost analysis and the NAT-instance option.
![[AWS Cost] A Guide to Cutting AWS Infrastructure Costs by 55% (Graviton Migration & Fixed-Cost Optimization Strategy)](assets/posts/aws-cost-optimization/cover.webp)
Cut AWS costs up to 55% (about ₩2M/month): x86→ARM/Graviton migration and swapping ALB, NAT, and RDS for Nginx, a NAT instance, and an EC2 DB — real quotes.
![[SQLAlchemy] Fixing the DPI-1047 Python Oracle DB Connection Error on AWS Graviton (ARM) | SQLAlchemy, oracledb](assets/posts/python-oracledb-arm-dpi-1047/cover.webp)
Why a Python-Oracle app that ran on x86_64 fails with DPI-1047 on AWS Graviton ARM — fixed with python-oracledb Thin mode: pure Python, no Instant Client.
![[AWS] EC2 SSH Connection Error: How to Fix the UNPROTECTED PRIVATE KEY FILE Error (ssh pem key permission setup)](assets/posts/ec2-ssh-unprotected-private-key/cover.webp)
When SSH-ing into EC2 you get 'WARNING: UNPROTECTED PRIVATE KEY FILE' — the .pem key's permissions are too open. Fix it instantly with chmod 400.
Install Nginx on a cloud server like AWS EC2 — version-specific installs on Ubuntu (apt) and CentOS (yum), the /etc/nginx config layout, and firewalls.
For Oracle folks moving to MS SQL Server, the confusing three-level Login, User, and Schema model vs Oracle's one-level design, plus the sysadmin-to-dbo lock.
![[AWS Infra] Building & Configuring a NAT Instance to Cut NAT Gateway Costs (Part 2)](assets/posts/nat-instance-build-2/cover.webp)
Part 1's community AMI runs an end-of-support OS. Part 2 builds a NAT instance on modern Ubuntu with iptables (forwarding + MASQUERADE), persisted on reboots.